Fix wrong sim results; Add bpgd with decimation info passing over max iter plots

src/final_presentation/main.tex

@@ -302,8 +302,8 @@
         \item Quantum systems are inherently fragile
         \item Interacting with the quantum state disturbs it
         \item Idea: Represent $k\in \mathbb{N} $ \schlagwort{logical
-            qubits} using $n \in \mathbb{N},~n>k$ \schlagwort{physical qubits}
-            \citereferencemanual{Rof19}
+            qubits} using $n \in \mathbb{N}$ \schlagwort{physical qubits},
+            $n>k$ \citereferencemanual{Rof19}
 
             \vspace*{2mm}
 
@@ -1532,8 +1532,8 @@
         \item \schlagwort{Detector error model} (DEM) combines
             detector error matrix and noise model
             \visible<2->{
-            \item Tanner graph of detector error matrix of \ac{bb} code
-                \citereferencemanual{KSW$^+$25}
+            \item Tanner graph of detector error matrix of bivariate
+                bicycle (\acs{bb}) code \citereferencemanual{KSW$^+$25}
             }
     \end{itemize}
 
@@ -1549,21 +1549,25 @@
 
     \vspace*{-5mm}
 
-    \visible<3->{
-        \begin{itemize}
+    \begin{itemize}
+            \visible<2->{
             \item Challenges
-                \begin{itemize}
+            }
+            \begin{itemize}
+                    \visible<2->{
+                    \item Fault tolerance: Additional error locations \\
+                        $\implies$ \schlagwort{Increased decoding
+                        complexity} \citereferencemanual{GCR24}
+                    }
+                    \visible<3->{
                     \item Quantum setting: Degeneracy and short
                         cycles \\
                         $\implies$ \schlagwort{Degraded performance}
                         of belief propagation (BP)
                         \citereferencemanual{BBA$^+$15}
-                    \item Fault tolerance: Additional error locations \\
-                        $\implies$ \schlagwort{Increased decoding
-                        complexity} \citereferencemanual{GCR24}
-                \end{itemize}
-        \end{itemize}
-    }
+                    }
+            \end{itemize}
+    \end{itemize}
 
     \vspace*{8mm}
 
@@ -1572,9 +1576,8 @@
         S. Koutsioumpas et al., ``Automorphism ensemble decoding of
         quantum LDPC codes,'' \emph{arXiv:2503.01738}, 2025.
     }
-    {GCR24}{A. Gong, S. Cammerer, and J. M. Renes, ``Toward
-        low-latency iterative decoding of qLDPC codes under
-        circuit-level noise,'' arXiv:2403.18901, 2024.
+    {GCR24}{A. Gong et al., ``Toward low-latency iterative decoding
+        of qLDPC codes under circuit-level noise,'' arXiv:2403.18901, 2024.
     }
     {BBA$^+$15}{
         Z. Babar et al., ``Fifteen years of
@@ -1634,9 +1637,8 @@
 %     S. Huang and S. Puri, ``Improved noisy syndrome decoding of
 %     quantum LDPC codes with sliding window,'' \emph{arXiv:2311.03307}, 2023.
 % }
-% {GCR24}{A. Gong, S. Cammerer, and J. M. Renes, ``Toward
-%     low-latency iterative decoding of qLDPC codes under
-%     circuit-level noise,'' arXiv:2403.18901, 2024.
+% {GCR24}{A. Gong et al., ``Toward low-latency iterative decoding
+%     of qLDPC codes under circuit-level noise,'' arXiv:2403.18901, 2024.
 % }
 % {RWB$^+$20}{
 %     J. Roffe et al., ``Decoding across the quantum low-density
@@ -1734,9 +1736,8 @@
         S. Huang and S. Puri, ``Improved noisy syndrome decoding of
         quantum LDPC codes with sliding window,'' \emph{arXiv:2311.03307}, 2023.
     }
-    {GCR24}{A. Gong, S. Cammerer, and J. M. Renes, ``Toward
-        low-latency iterative decoding of qLDPC codes under
-        circuit-level noise,'' arXiv:2403.18901, 2024.
+    {GCR24}{A. Gong et al., ``Toward low-latency iterative decoding
+        of qLDPC codes under circuit-level noise,'' arXiv:2403.18901, 2024.
     }
     \stopreferencesmanual
 \end{frame}
@@ -2882,11 +2883,12 @@
         \vspace*{-10mm}
         \centering
         \begin{itemize}
-            \only<1>{\vspace*{10mm}}
+                \only<1>{\vspace*{10mm}}
             \item Most errors due to non-convergence
                 \vspace*{10mm}
                 \visible<2-> {
-                \item BPGD algorithm \citereferencemanual{YLH+24}
+                \item BP with guided decimation (BPGD)
+                    \citereferencemanual{YLH+24}
                     \begin{enumerate}
                         \item Perform $T$ \schlagwort{BP iterations}
                         \item Hard decision on \schlagwort{most
@@ -2906,12 +2908,12 @@
             \vspace*{-10mm}
 
             \begin{itemize}
-                \item $[[882, 24, 18 \le d \le 24]]$ - generalized
-                    hypergraph product (GHP) code, \\
+                \item $\llbracket 882, 24, 18 \le d \le 24
+                    \rrbracket$ generalized hypergraph product (GHP) code,
                     bit-flip noise \citereferencemanual{YLH+24}
             \end{itemize}
 
-            \vspace*{-5mm}
+            % \vspace*{-5mm}
 
             \begin{figure}[H]
                 \centering
@@ -2971,7 +2973,7 @@
         }
     \end{minipage}
 
-    \vspace*{2mm}
+    \vspace*{5mm}
 
     \addreferencesmanual
     {YLH+24}{Hanwen Yao et al. ``Belief propagation decoding of quantum
@@ -3329,7 +3331,7 @@
             \item Parameters
                 \begin{itemize}
                     \item $T = 1$
-                    \item $n_\text{iterations} = n$
+                    \item $n_\text{iterations} = 3{,}600$
                     \item $W = 5$
                 \end{itemize}
         \end{itemize}
@@ -3885,9 +3887,8 @@
     \vspace*{15mm}
 
     \addreferencesmanual
-    {GCR24}{A. Gong, S. Cammerer, and J. M. Renes, ``Toward
-        low-latency iterative decoding of qLDPC codes under
-        circuit-level noise,'' arXiv:2403.18901, 2024.
+    {GCR24}{A. Gong et al., ``Toward low-latency iterative decoding
+        of qLDPC codes under circuit-level noise,'' arXiv:2403.18901, 2024.
     }
     {MSL$^+$25}{
         S. Miao et al., ``Quaternary neural belief propagation
@@ -4107,9 +4108,8 @@
     \vspace*{30mm}
 
     \addreferencesmanual
-    {GCR24}{A. Gong, S. Cammerer, and J. M. Renes, ``Toward
-        low-latency iterative decoding of qLDPC codes under
-        circuit-level noise,'' arXiv:2403.18901, 2024.
+    {GCR24}{A. Gong et al., ``Toward low-latency iterative decoding
+        of qLDPC codes under circuit-level noise,'' arXiv:2403.18901, 2024.
     }
     \stopreferencesmanual
 \end{frame}
@@ -4170,9 +4170,8 @@
     \vspace*{5mm}
 
     \addreferencesmanual
-    {GCR24}{A. Gong, S. Cammerer, and J. M. Renes, ``Toward
-        low-latency iterative decoding of qLDPC codes under
-        circuit-level noise,'' arXiv:2403.18901, 2024.
+    {GCR24}{A. Gong et al., ``Toward low-latency iterative decoding
+        of qLDPC codes under circuit-level noise,'' arXiv:2403.18901, 2024.
     }
     \stopreferencesmanual
 \end{frame}

src/thesis/acronyms.tex

@@ -8,16 +8,31 @@
     long=belief propagation
 }
 
+\DeclareAcronym{bpgd}{
+    short=BPGD,
+    long=belief propagation with guided decimation
+}
+
 \DeclareAcronym{nms}{
     short=NMS,
     long=normalized min-sum
 }
 
+\DeclareAcronym{bsc}{
+    short=BSC,
+    long=binary symetric channel
+}
+
 \DeclareAcronym{spa}{
     short=SPA,
     long=sum-product algorithm
 }
 
+\DeclareAcronym{css}{
+    short=CSS,
+    long=Calderbank-Shor-Steane
+}
+
 \DeclareAcronym{llr}{
     short=LLR,
     long=log-likelihood ratio
@@ -33,6 +48,11 @@
     long=low-density parity-check
 }
 
+\DeclareAcronym{qldpc}{
+    short=QLDPC,
+    long=quantum low-density parity-check
+}
+
 \DeclareAcronym{ml}{
     short=ML,
     long=maximum likelihood
@@ -77,3 +97,8 @@
     short=PDF,
     long=probability density function
 }
+
+\DeclareAcronym{bb}{
+    short=BB,
+    long=bivariate bicycle
+}

src/thesis/chapters/2_fundamentals.tex

@@ -1,4 +1,4 @@
-\chapter{Fundamentals}
+\chapter{Fundamentals of Classical and Quantum Error Correction}
 \label{ch:Fundamentals}
 
 \Ac{qec} is a field of research combining ``classical''
@@ -6,8 +6,6 @@ communications engineering and quantum information science.
 This chapter provides the relevant theoretical background on both of
 these topics and subsequently introduces the fundamentals of \ac{qec}.
 
-% TODO: Is an explanation of BP with guided decimation needed in this chapter?
-% TODO: Is an explanation of OSD needed chapter?
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \section{Classical Error Correction}
 \label{sec:Classical Error Correction}
@@ -517,6 +515,7 @@ This is precisely the effect that leads to the good performance of
 \ac{sc}-\ac{ldpc} codes in the waterfall region \cite{costello_spatially_2014}.
 
 \subsection{Iterative Decoding}
+\label{subsec:Iterative Decoding}
 
 % Introduction
 
@@ -607,21 +606,23 @@ The purpose of this section is to convey these concepts to the reader.
 
 In quantum mechanics, the state of a particle is described by a
 \emph{wave function} $\psi(x,t)$.
-The connection between this function and the observable world
-is Born's statistical interpretation:
-$\lvert \psi (x,t) \rvert^2$ is the \ac{pdf} of finding a praticle at
+Born's statistical interpretation provides a connection between this
+function and the observable world:
+$\lvert \psi (x,t) \rvert^2$ is the \ac{pdf} of finding a particle at
 position $x$ and time $t$ \cite[Sec.~1.2]{griffiths_introduction_1995}.
+Note that this presupposes a normalization of $\psi$ such that
+$\int_{-\infty}^{\infty} \lvert \psi(x,t) \rvert^2 dx = 1$.
 
 % Dirac notation
 
-A lot of the related mathematics can be very elegantly expressed
+Much of the related mathematics can be very elegantly expressed
 using the language of linear algebra.
-The so called Bra-ket or Dirac notation is especially appropriate,
+The so-called Bra-ket or Dirac notation is especially appropriate,
 having been proposed by Paul Dirac in 1939 for the express purpose
 of simplifying quantum mechanical notation \cite{dirac_new_1939}.
 Two new symbols are defined, \emph{bra}s $\bra{\cdot}$ and
 \emph{ket}s $\ket{\cdot}$.
-Kets denote ordinary vectors, while bras denote their Hermitian conjugates.
+Kets denote column vectors, while bras denote their Hermitian conjugates.
 For example, two vectors specified by the labels $a$ and $b$
 respectively are written as $\ket{a}$ and $\ket{b}$.
 Their inner product is $\braket{a\vert b}$.
@@ -630,7 +631,7 @@ Their inner product is $\braket{a\vert b}$.
 
 The connection we will make between quantum mechanics and linear
 algebra is that we will model the state space of a system as a
-\emph{function space}.
+\emph{function space}, the Hilbert space $L_2$.
 We will represent the state of a particle with wave function
 $\psi(x,t)$ using the vector $\ket{\psi}$
 \cite[Sec.~3.3]{griffiths_introduction_1995}.
@@ -643,6 +644,17 @@ output \cite[Sec.~3.2.2]{griffiths_introduction_1995}.
 Operators are useful to describe the relations between different
 quantities relating to a particle.
 An example of this is the differential operator $\partial x$.
+We define the \emph{commutator} of two operators $P_1$ and $P_2$ as
+\begin{align*}
+    [P_1,P_2] = P_1P_2 - P_2P_1
+\end{align*}
+and the \emph{anticommutator} as
+\begin{align*}
+    [P_1,P_2]_+ = P_1P_2 + P_2P_1
+    .%
+\end{align*}
+We say the two operators \emph{commute} iff $[P_1,P_2] = 0$, and they
+\emph{anti-commute} iff $[P_1,P_2]_+ = 0$.
 
 %%%%%%%%%%%%%%%%
 \subsection{Observables}
@@ -663,8 +675,8 @@ observations \cite[Sec.~3.3]{griffiths_introduction_1995}.
 
 If we know the wave function of a particle, we should be able to
 compute the expected value $\braket{Q}$ of any observable quantity we wish.
-It can be shown that for any $Q$, we can compute a
-corresponding operator $\hat{Q}$ such that
+It can be shown that for any $Q$, we can find a
+corresponding Hermitian operator $\hat{Q}$ such that
 \cite[Sec.~3.3]{griffiths_introduction_1995}
 \begin{align}
     \label{eq:gen_expr_Q_exp}
@@ -689,7 +701,7 @@ formula simplifies to the direct calculation of the expected value.
 
 Let us now examine how the observable operator $\hat{Q}$ relates to
 the determinate states of the observable quantity.
-We begin by translating \autoref{eq:gen_expr_Q_exp} into linear alebra as
+We begin by translating \autoref{eq:gen_expr_Q_exp} into linear algebra as
 \cite[Eq.~3.114]{griffiths_introduction_1995}
 \begin{align}
     \label{eq:gen_expr_Q_exp_lin}
@@ -697,7 +709,7 @@ We begin by translating \autoref{eq:gen_expr_Q_exp} into linear alebra as
     .%
 \end{align}
 \autoref{eq:gen_expr_Q_exp_lin} expresses an inherently probabilistic
-relationhip.
+relationship.
 The determinate states are inherently deterministic.
 To relate the two, we note that since determinate states should
 always yield the same measurement results, the variance of the
@@ -742,6 +754,9 @@ We can use the determinate states for this purpose, expressing the state as%
     c_n := \braket{e_n \vert \psi}
     .%
 \end{align}
+Because of the normalization of the wave function such that
+$\int_{-\infty}^{\infty} \lvert \psi(x,t) \rvert^2 dx = 1$, we have
+$\sum_{n=1}^{\infty} \lvert c_n \rvert ^2 = 1$.
 Inserting \autoref{eq:determinate_basis} into
 \autoref{eq:gen_expr_Q_exp_lin} we obtain
 % tex-fmt: off
@@ -771,7 +786,7 @@ We can decompose an arbitrary state as $\ket{\psi} = \sum_{n=1}^{\infty} c_n
 \ket{e_n}$, where $\lvert c_n \rvert ^2$ represents the probability
 of obtaining a certain measurement value.
 Note that when we speak of an \emph{observable}, we are usually
-refering to the operator $\hat{Q}$.
+referring to the operator $\hat{Q}$.
 
 %%%%%%%%%%%%%%%%
 \subsection{Projective Measurements}
@@ -837,7 +852,7 @@ These project a vector onto the subspace spanned by $\ket{e_n}$.
 \subsection{Qubits and Multi-Qubit States}
 \label{subsec:Qubits and Multi-Qubit States}
 
-% The qubit
+% Intro
 
 % TODO: Make sure `quantum gate` is proper terminology
 A central concept for quantum computing is that of the \emph{qubit}.
@@ -846,20 +861,35 @@ For classical computers, we alter bits' states using \emph{gates}.
 We can chain multiple of these gates together to build up more complex logic,
 such as half-adders or eventually a full processor.
 In principle, quantum computers work in a similar fashion, only that
-instead of bits we use qubits and instead of, e.g. {AND}, OR, and XOR
+instead of bits we use qubits and instead of, e.g., AND, OR, and XOR
 operations we use \emph{quantum gates} \cite[Sec.~1.3]{nielsen_quantum_2010}.
-We define a qubit to be a component with determinate
-states $\ket{0}$ and $\ket{1}$.
-The general description of the state $\ket{\psi}$ of a qubit is thus
-\begin{align}
-    \label{eq:gen_qubit_state}
-    \ket{\psi} = \alpha\ket{0} + \beta\ket{1}, \hspace{5mm} \alpha,
-    \beta \in \mathbb{C}
+
+% Qubits and multi-qubit states
+
+We fix an orthonormal basis of $\mathbb{C}^2$ to be
+\begin{align*}
+    \ket{0} =
+    \begin{pmatrix}
+        1 \\
+        0
+    \end{pmatrix}, \hspace{5mm}
+    \ket{1} =
+    \begin{pmatrix}
+        0 \\
+        1
+    \end{pmatrix}
     .%
-\end{align}
-
-% The tensor product and multi-qubit states
-
+\end{align*}
+A qubit is defined to be a system with quantum state
+\begin{align*}
+    \ket{\psi} =
+    \begin{pmatrix}
+        \alpha \\
+        \beta
+    \end{pmatrix}
+    = \alpha \ket{0} + \beta \ket{1}
+    .%
+\end{align*}
 The overall state of a composite quantum system is described using
 the \emph{tensor product}, denoted as $\otimes$
 \cite[Sec.~2.2.8]{nielsen_quantum_2010}.
@@ -869,9 +899,7 @@ Take for example the two qubits
     \ket{\psi_2} = \alpha_2 \ket{0} + \beta_2 \ket{1}
     .%
 \end{align*}
-% TODO: Fix the fact that \psi is used above for the single-qubit
-% case and below for the multi-qubit case
-We examine the state $\ket{\psi}$ of the composite system as.
+We examine the state $\ket{\psi}$ of the composite system.
 Assuming the qubits are independent, this is a \emph{product state}
 $\ket{\psi} = \ket{\psi_1}\otimes\ket{\psi_2}$.
 When not ambiguous, we may omit the tensor product symbol or even write
@@ -893,6 +921,12 @@ We have
 \end{align}
 We call $\ket{x_0, \ldots, x_n}~, x_i \in \{0,1\}$ the
 \emph{computational basis states} \cite[Sec.~4.6]{nielsen_quantum_2010}.
+To additionally simplify set notation, we define
+\begin{align*}
+    \mathcal{M}^{\otimes n} := \underbrace{\mathcal{M}\otimes \ldots
+    \otimes \mathcal{M}}_{n \text{ times}}
+    .%
+\end{align*}
 
 % Entanglement
 
@@ -902,9 +936,9 @@ An example of such states are the \emph{Bell states}
 \begin{align*}
     \begin{split}
         \ket{\psi_{00}} &= \frac{\ket{00} + \ket{11}}{\sqrt{2}} \hspace{15mm}
-        \ket{\psi_{01}} = \frac{\ket{01} - \ket{10}}{\sqrt{2}} \\
-        \ket{\psi_{10}} &= \frac{\ket{00} + \ket{11}}{\sqrt{2}} \hspace{15mm}
-        \ket{\psi_{11}} = \frac{\ket{01} - \ket{10}}{\sqrt{2}}
+        \ket{\psi_{01}} = \frac{\ket{01} + \ket{10}}{\sqrt{2}} \\
+        \ket{\psi_{10}} &= \frac{\ket{01} - \ket{10}}{\sqrt{2}} \hspace{15mm}
+        \ket{\psi_{11}} = \frac{\ket{00} - \ket{11}}{\sqrt{2}}
     \end{split}
     \hspace{4mm}.%
 \end{align*}
@@ -933,10 +967,10 @@ After examining the modelling of single- and multi-qubit systems,
 we now shift our focus to describing the evolution of their states.
 We model state changes as operators.
 Unlike classical systems, where there are only two possible states and
-thus the only possible state change is a bit-flip, a gerenal qubit
+thus the only possible state change is a bit-flip, a general qubit
 state as shown in \autoref{eq:gen_qubit_state} lives on a continuum of values.
 We thus technically also have an infinite number of possible state changes.
-Luckily, we can express any operator as a linear combination of the
+Fortunately, we can express any operator as a linear combination of the
 \emph{Pauli operators} \cite[Sec.~2.2]{gottesman_stabilizer_1997}
 \cite[Sec.~2.2]{roffe_quantum_2019}
 \begin{align*}
@@ -957,23 +991,31 @@ Luckily, we can express any operator as a linear combination of the
     \begin{array}{c}
         Z\text{ Operator} \\
         \hline\\
-        \ket{0} \mapsto -\ket{0} \\
+        \ket{0} \mapsto \phantom{-}\ket{0} \\
         \ket{1} \mapsto -\ket{1}
     \end{array}%
     \hspace{10mm}%
     \begin{array}{c}
         Y\text{ Operator} \\
         \hline\\
-        \ket{0} \mapsto -j\ket{1} \\
+        \ket{0} \mapsto \phantom{-}j\ket{1} \\
         \hspace{2.75mm}\ket{1} \mapsto -j\ket{0} \hspace*{1mm}.
     \end{array}
 \end{align*}
+In fact, if we allow for complex coefficients, the $X$ and $Z$
+operators are sufficient to express any other operator as a linear
+combination \cite[Sec.~2.2]{roffe_quantum_2019}.
 $I$ is the identity operator and $X$ and $Z$ are referred to as
 \emph{bit-flips} and \emph{phase-flips} respectively.
-We also call these operators \emph{gates}.
+We call the set $\mathcal{G}_n = \left\{ \pm I,\pm jI, \pm X,\pm jX,
+\pm Y,\pm jY, \pm Z, \pm jZ \right\}^{\otimes n}$ the \emph{Pauli
+group} over $n$ qubits.
+
+In the context of modifying qubit states, we also call operators \emph{gates}.
 When working with multi-qubit systems, we can also apply Pauli gates
-to individual qubits independently, e.g., $I_1 X_2 I_3 Z_4 Y_5$.
-We often omit the identity operators, instead writing $X_2 Z_4 Y_5$.
+to individual qubits independently, which we write, e.g., as $I_1 X_2
+I_3 Z_4 Y_5$.
+We often omit the identity operators, instead writing, e.g., $X_2 Z_4 Y_5$.
 Other important operators include the \emph{Hadamard} and
 \emph{controlled-NOT (CNOT)} gates \cite[Sec.~1.3]{nielsen_quantum_2010}
 \vspace*{-7mm}
@@ -1010,20 +1052,51 @@ Other important operators include the \emph{Hadamard} and
 \noindent Many more operators relevant to quantum computing exist, but they are
 not covered here as they are not central to this work.
 
-\indent\red{[We only need to consider X and Z errors]
-\cite[Equation~8]{roffe_quantum_2019}} \\
-\indent\red{[Explain commuting/anticommuting property of operators]
-[Journal~p.~46]}
-
 %%%%%%%%%%%%%%%%
 \subsection{Quantum Circuits}
 \label{Quantum Circuits}
 
-\noindent\indent\red{[Controlled operations]
-\cite[Sec.~4.3]{nielsen_quantum_2010}} \\
-\indent\red{[In case this reference is needed: Measurements
-\cite[Sec.~4.4]{nielsen_quantum_2010}]} \\
-\indent\red{[General circuit stuff] \cite[Sec.~1.3.4]{nielsen_quantum_2010}}
+% Intro
+
+Using these quantum gates, we can construct \emph{circuits} to manipulate
+the states of qubits \cite[Sec.~1.3.4]{nielsen_quantum_2010}.
+Circuits are read from left to right and each horizontal wire
+represents a qubit whose state evolves as it passes through
+successive gates.
+
+% General notation
+
+A single line carries a quantum state, while a double line
+denotes a classical bit, typically used to carry the result of a measurement.
+A measurement is represented by a meter symbol.
+In general, gates are represented as labeled boxes placed on one or more wires.
+An exception is the CNOT gate, where the operation is represented as
+the symbol $\oplus$.
+
+% Controlled gates & example
+
+We can additionally add a control input to a gate.
+This conditions its application on the state of another qubit
+\cite[Sec.~4.3]{nielsen_quantum_2010}.
+The control connection is represented by a vertical line connecting
+the gate to the corresponding qubit, where a filled dot is placed.
+A controlled gate applies the respective operation only if the
+control qubit is in state $\ket{1}$.
+An example of this is the CNOT gate introduced in
+\autoref{subsec:Qubits and Multi-Qubit States}, which is depicted in
+\autoref{fig:cnot_circuit}.
+
+\begin{figure}[t]
+    \centering
+
+    \begin{quantikz}
+        \lstick{$\ket{\psi}_1$} & \ctrl{1} & \\
+        \lstick{$\ket{\psi}_2$} & \targ{}  & \\
+    \end{quantikz}
+
+    \caption{CNOT gate circuit.}
+    \label{fig:cnot_circuit}
+\end{figure}
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \section{Quantum Error Correction}
@@ -1035,11 +1108,11 @@ not covered here as they are not central to this work.
 
 One of the major barriers on the road to building a functioning
 quantum computer is the inevitability of errors during quantum
-computation due to the difficulty in sufficiently isolating the
+computation. These arise due to the difficulty in sufficiently isolating the
 qubits from external noise \cite[Intro.]{roffe_quantum_2019}.
 This isolation is critical for quantum systems, as the constant interactions
-with the environment act as small measurements, leading to the
-eventual \emph{decoherence} of the quantum state
+with the environment act as small measurements, an effect called
+\emph{decoherence} of the quantum state
 \cite[Intro.]{gottesman_stabilizer_1997}.
 \ac{qec} is one approach of dealing with this problem, by protecting
 the quantum state in a similar fashion to information in classical error
@@ -1047,12 +1120,12 @@ correction.
 
 % The unique challenges of QEC
 
-The problem setting of \ac{qec} differs slightly from the classical case, as
-three main restrictions apply \cite[Sec.~2.4]{roffe_quantum_2019}:
+The problem setting of \ac{qec} differs slightly from the classical case.
+Three main restrictions apply \cite[Sec.~2.4]{roffe_quantum_2019}:
 \begin{itemize}
     \item The no-cloning theorem states that it is
         impossible to exactly copy the state of one qubit into another.
-    \item Qubit are susceptible to more types of errors than
+    \item Qubits are susceptible to more types of errors than
         just bit-flips, as we saw in
         \autoref{subsec:Qubits and Multi-Qubit States}.
     \item Directly measuring the state of a qubit collapses it onto
@@ -1063,16 +1136,32 @@ three main restrictions apply \cite[Sec.~2.4]{roffe_quantum_2019}:
 % General idea (logical vs. physical gates) + notation
 
 Much like in classical error correction, in \ac{qec} information
-is protected by mapping it onto codewords in an expanded space,
+is protected by mapping it onto codewords in a higher-dimensional space,
 thereby introducing redundancy.
 To this end, $k \in \mathbb{N}$ \emph{logical qubits} are mapped onto
-$n \in \mathbb{N},~n>k$ \emph{physical qubits}.
-We circumvent the no-cloning restriction by not copying the state of
-the $k$ logical qubits, instead spreading it out over all $n$
-physical ones \cite[Intro.]{calderbank_good_1996}
-To differentiate a quantum codes from classical ones, we denote a
+$n \in \mathbb{N}$ \emph{physical qubits}, $n>k$.
+We circumvent the no-cloning restriction by not copying the state of any of
+the $k$ logical qubits, instead spreading the total state out over all $n$
+physical qubits \cite[Intro.]{calderbank_good_1996}.
+To differentiate quantum codes from classical ones, we denote a
 code with parameters $k,n$ and minimum distance $d_\text{min}$ using
-double brackets, as $[[ n,k,d_\text{min} ]]$ \cite[Sec.~4]{roffe_quantum_2019}.
+double brackets, as $\llbracket n,k,d_\text{min} \rrbracket$
+\cite[Sec.~4]{roffe_quantum_2019}.
+
+% The backlog problem
+
+Another difference between quantum and classical error correction
+lies in the resource constraints.
+For \ac{qec}, the most important property is low latency, not, e.g.,
+low overall computational complexity.
+This is due to the \emph{backlog problem}
+\cite[Sec.~II.G.3.]{terhal_quantum_2015}: There are certain gates
+at which the effect of existing errors on single qubits may be
+exacerbated by transforming them to multi-qubit errors.
+We wish to correct the errors before passing qubits through such gates.
+If the \ac{qec} system is not fast enough, there will be an increasing
+backlog of information at this point in the circuit, leading to an
+exponential slowdown in computation.
 
 %%%%%%%%%%%%%%%%
 \subsection{Stabilizer Measurements}
@@ -1092,8 +1181,8 @@ Consider the two-qubit repetition code
     \underbrace{\ket{11}}_{=:\ket{1}_\text{L}}
     .%
 \end{align*}
-We call $\ket{\psi}_L$ the logical state.
-We define the \emph{codespace} as $\mathcal{C} := \text{span}\mleft\{
+We call $\ket{\psi}_L$ the logical state, and
+we define the \emph{codespace} as $\mathcal{C} := \text{span}\mleft\{
 \ket{00}, \ket{11} \mright\}$ and the \emph{error subspace} as
 $\mathcal{F} := \text{span} \mleft\{\ket{01}, \ket{10} \mright\}$.
 Note that this code is only able to detect single $X$-type errors.
@@ -1132,9 +1221,9 @@ $E\ket{\psi}_\text{L}$ lies in $\mathcal{C}$ or $\mathcal{F}$.
 % non-compromising meausrement of the information
 To do this without directly observing (and thus potentially
 collapsing) the logical state $\ket{\psi}_\text{L}$, we prepare an
-ancilla qubit with state $\ket{0}_\text{A}$ and we entangle it with
+ancilla qubit with state $\ket{0}_\text{A}$ and entangle it with
 $\ket{\psi}_\text{L}$ in such a way that the eigenvalue is indicated
-by measuring that instead.
+by measuring the ancilla qubit instead.
 More specifically, using a stabilizer measurement circuit as shown in
 \autoref{fig:stabilizer_measurement}, we transform the state of the
 three-qubit system as
@@ -1158,62 +1247,13 @@ the ancilla qubit. Similarly, if $E \ket{\psi}_\text{L} \in
 \begin{figure}[t]
     \centering
 
-    \tikzset{
-        meter/.append style={
-            draw, rectangle,
-            font=\vphantom{A}, minimum width=8mm, minimum height=8mm,
-            path picture={
-                \draw[black]
-                ([shift={(.1,.3)}]path picture bounding box.south west)
-                to[bend left=50]
-                ([shift={(-.1,.3)}]path picture bounding box.south east);
-                \draw[black,-latex]
-                ([shift={(0,.1)}]path picture bounding box.south)
-                -- ([shift={(.3,-.1)}]path picture bounding box.north);
-            }
-        }
-    }
-
-    \begin{tikzpicture}
-        \node[rectangle, minimum width=2cm, minimum height=3cm, draw]
-        (ZZ) {$Z_1Z_2$};
-
-        \coordinate (qi1) at (-3, 1);
-        \coordinate (qi2) at (-3, -1);
-        \coordinate (qi3) at (-3, -3);
-
-        \coordinate (qo1) at (4, 1);
-        \coordinate (qo2) at (4, -1);
-        \coordinate (qo3) at (4, -3);
-
-        \node[rectangle, minimum width=8mm, minimum height=8mm, draw]
-        (H1) at ($(qo3 -| ZZ) + (-2, 0)$) {H};
-        \node[rectangle, minimum width=8mm, minimum height=8mm, draw]
-        (H2) at ($(qo3 -| ZZ) + (2, 0)$) {H};
-        \node[circle, fill] (not) at (H1 -| ZZ) {};
-        \node[meter, right=5mm of H2] (mes) {};
-
-        \draw (qi1) -- (ZZ.west |- qi1);
-        \draw (qi2) -- (ZZ.west |- qi2);
-
-        \draw (qo1) -- (ZZ.east |- qo1);
-        \draw (qo2) -- (ZZ.east |- qo2);
-
-        \draw (qi3) -- (H1) -- (not) -- (H2) -- (mes);
-
-        \draw (not) -- (ZZ);
-
-        \coordinate (qo3u) at ($(qo3) + (0, .5mm)$);
-        \coordinate (qo3d) at ($(qo3) + (0, -.5mm)$);
-
-        \draw (mes.east |- qo3u) -- (qo3u);
-        \draw (mes.east |- qo3d) -- (qo3d);
-
-        \node[left] at (qi3) {$\ket{0}_\text{A}$};
-        \node[left] at ($(qi1)!.5!(qi2)$) {$E\ket{\psi}_\text{L}$};
-        \node[right] at ($(qo1)!.5!(qo2)$) {$E\ket{\psi}_\text{L}$};
-
-    \end{tikzpicture}
+    % tex-fmt: off
+    \begin{quantikz}
+        \lstick[2]{$E\ket{\psi}_\text{L}$}    &          & \gate[2]{Z_1Z_2}   &          &          &                 \\
+                                              &          &                    &          &          &                 \\
+        \lstick{$\ket{0}_\text{A}$}           & \gate{H} & \ctrl{-1}          & \gate{H} & \meter{} & \setwiretype{c} \\
+    \end{quantikz}
+    % tex-fmt: on
 
     \caption{Stabilizer measurement circuit for the two-qubit repetition code.}
     \label{fig:stabilizer_measurement}
@@ -1237,23 +1277,25 @@ E.g., $P_\mathcal{C}$ will eliminate all components of $E
 \ket{\psi}_\text{L}$ that lie in $\mathcal{F}$.
 This process, together with the fact that any coherent error can be
 decomposed into a linear combination of $X$ and $Z$ errors, means
-that it is enough for a \ac{qec} to be able to correct only $X$ and $Z$ errors.
+that it is sufficient for \ac{qec} to be able to correct only these
+types of errors.
 This effect is referred to as error \emph{digitization}
 \cite[Sec.~2.2]{roffe_quantum_2019}.
 
 % The stabilizer group
 
 Operators such as $Z_1Z_2$ above are called \emph{stabilizers}.
-An operator $P_i \in \mathcal{G}_n$ is called a stabilizer of an
+More generally, an operator $P_i \in \mathcal{G}_n$ is called a stabilizer of an
 $[[n, k, d_\text{min}]]$ code $\mathcal{C}$, if
 \begin{itemize}
     \item It stabilizes all logical states, i.e.,
         $P_i\ket{\psi}_\text{L} = (+1)\ket{\psi}_\text{L} ~\forall~
         \ket{\psi}_\text{L} \in \mathcal{C}$.
-    \item It commutes with all other stabilizers of the code. This
-        property is important to be able to measure the eigenvalue of
-        a stabilizer without disturbing the eigenvectors of the
-        others \cite[Sec.~1.2]{gottesman_stabilizer_1997}.
+    \item It commutes with all other stabilizers $P_j$ of the code,
+        i.e., $[P_i, P_j] = 0$.
+        This property is important to be able to measure the
+        eigenvalue of a stabilizer without disturbing the
+        eigenvectors of the others \cite[Sec.~1.2]{gottesman_stabilizer_1997}.
 \end{itemize}
 Formally, we define the \emph{stabilizer group} $\mathcal{S}$ as
 \cite[Sec.~4.1]{roffe_quantum_2019}
@@ -1291,11 +1333,11 @@ and the stabilizer measurement returns 1.
 
 For classical binary linear block codes, we use $n-k$ parity-checks
 to reduce the degrees of freedom introduced by the encoding operation.
-Effectively, each parity-check defines a local code, splitting the
-vector space in half, with only one half containing valid codewords.
+Effectively, each parity-check defines a local code splitting the
+vector space in half, with only one part containing valid codewords.
 The global code is the intersection of all local codes.
 We can do the same in the quantum case.
-Each split is represented using stabilizer, whose eigenvalues signify
+Each split is represented using a stabilizer, whose eigenvalues signify
 whether a candidate vector lies in the local codespace or local error subspace.
 It is only a valid codeword if it lies in the codespace of all local codes.
 We call codes constructed this way \emph{stabilizer codes}.
@@ -1305,45 +1347,86 @@ We call codes constructed this way \emph{stabilizer codes}.
 Similar to the classical case, we can use a syndrome vector to
 describe which local codes are violated.
 To obtain the syndrome, we simply measure the corresponding
-operators, each using a circuit as explained in
+operators $P_i$, each using a circuit as explained in
 \autoref{subsec:Stabilizer Measurements}.
-A full \emph{syndrome extraction circuit} is depicted in \autoref{fig:sec}.
+Note that this is an abstract representation of the syndrome extraction.
+For the actual implementation in hardware, we can transform this into
+a circuit that requires only CNOT and H-gates
+\cite[Sec.~10.5.8]{nielsen_quantum_2010}.
 
-% TODO: Move this further up to the commutativity of operators?
-\indent\red{[Fixing the error after finding it
-\cite[Sec.~10.5.5]{nielsen_quantum_2010}]} \\
-\indent\red{[Logical operators \cite[Sec.~4.2]{roffe_quantum_2019}]} \\
-\indent\red{[Measuring logical operators gives yields the outcomes of
-the encoded computations \cite[Sec.~2.6]{derks_designing_2025}]} \\
-\indent\red{[X and Z measurements can be performed with only CNOT and
-Hadamard gates \cite[Sec.~10.5.8]{nielsen_quantum_2010}]} \\
-\indent\red{[(?) Stabilizer generators]} \\
-\indent\red{[Parity-check matrix \cite[Sec.~10.5.1]{nielsen_quantum_2010}]}
+% Logical operators
+
+In order to modify the logical state encoded using the physical
+qubits, we can use \emph{logical operators} \cite[Sec.~4.2]{roffe_quantum_2019}.
+For each qubit, there are two logical operators, $X_i$ and $Z_j$.
+These are operators that
+\begin{itemize}
+    \item Commute with all the stabilizers in $\mathcal{S}$.
+    \item Anti-commute with one another, i.e., $[ \overline{X}_i,
+        \overline{Z}_i ]_{+} = \overline{X}_i \overline{Z}_i +
+        \overline{Z}_i \overline{X}_i = 0$.
+\end{itemize}
+We can also measure these operators to find out the logical state a
+physical state corresponds to \cite[Sec.~2.6]{derks_designing_2025}.
+
+% Parity-check matrix
+
+% TODO: Do I have to introduce before that stabilizers only need X
+% and Z operators?
+We can represent stabilizer codes using a \emph{check matrix}
+\cite[Sec.~10.5.1]{nielsen_quantum_2010}
+\begin{align*}
+    \bm{H} = \left[
+        \begin{array}{c|c}
+            \bm{H}_X & \bm{H}_Z
+        \end{array}
+    \right]
+    ,%
+\end{align*}
+with $\bm{H} \in \mathbb{F}_2^{(n-k)\times(2n)}$.
+This is similar to a classical \ac{pcm} in that it contains $n-k$
+rows, each describing one constraint. Each constraint restricts an additional
+degree of freedom of the higher-dimensional space we use to introduce
+redundancy.
+In contrast to the classical case, this matrix now has $2n$ columns,
+as we have to consider both the $X$ and $Z$ type operators that make up
+the stabilizers.
+Take for example the Steane code \cite[Eq.~10.83]{nielsen_quantum_2010}.
+We can describe it using the check matrix
+\begin{align}
+    \label{eq:steane}
+    \bm{H}_\text{Steane} = \left[
+        \begin{array}{ccccccc|ccccccc}
+            0 & 0 & 0 & 1 & 1 & 1 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\
+            0 & 1 & 1 & 0 & 0 & 1 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\
+            1 & 0 & 1 & 0 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 0 & 0 \\
+            0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 & 1 & 1 & 1 \\
+            0 & 0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 & 1 & 0 & 0 & 1 & 1 \\
+            0 & 0 & 0 & 0 & 0 & 0 & 0 & 1 & 0 & 1 & 0 & 1 & 0 & 1
+        \end{array}
+    \right]
+    .%
+\end{align}
+The first $n$ columns correspond to $X$ operators acting on the
+corresponding physical qubit, the rest to the $Z$ operators.
 
 \begin{figure}[t]
     \centering
 
-    \tikzset{
-        meter/.append style={
-            draw, rectangle,
-            font=\vphantom{A}, minimum width=8mm, minimum height=8mm,
-            path picture={
-                \draw[black]
-                ([shift={(.1,.3)}]path picture bounding box.south west)
-                to[bend left=50]
-                ([shift={(-.1,.3)}]path picture bounding box.south east);
-                \draw[black,-latex]
-                ([shift={(0,.1)}]path picture bounding box.south)
-                -- ([shift={(.3,-.1)}]path picture bounding box.north);
-            }
-        }
-    }
-
-    \red{Hier könnte Ihre Werbung stehen.}
+    % tex-fmt: off
+    \begin{quantikz}
+        \lstick[2]{$E\ket{\psi}_\text{L}$}  &          & \gate[2]{P_1} & \gate[2]{P_2} & \gate[style={draw=none},2]{\ldots} & \gate[2]{P_{n-k}} &          &          &                 \\
+                                            &          &               &               &                                    &                   &          &          &                 \\
+        \lstick{$\ket{0}_{\text{A}_1}$}     & \gate{H} & \ctrl{-1}     &               &                                    &                   & \gate{H} & \meter{} & \setwiretype{c} \\
+        \lstick{$\ket{0}_{\text{A}_2}$}     & \gate{H} &               & \ctrl{-2}     &                                    &                   & \gate{H} & \meter{} & \setwiretype{c} \\
+        \vdots\setwiretype{n}               &          &               &               &                                    &                   &          &          & \vdots          \\
+        \lstick{$\ket{0}_{\text{A}_{n-k}}$} & \gate{H} &               &               &                                    & \ctrl{-4}         & \gate{H} & \meter{} & \setwiretype{c} \\
+    \end{quantikz}
+    % tex-fmt: on
 
     \caption{
-        \red{Illustration of a general syndrome extraction circuit.
-        Adapted from \cite[Figure~4]{roffe_quantum_2019}.}
+        Illustration of a full syndrome extraction circuit.
+        Adapted from \cite[Figure~4]{roffe_quantum_2019}.
     }
     \label{fig:sec}
 \end{figure}
@@ -1352,76 +1435,275 @@ Hadamard gates \cite[Sec.~10.5.8]{nielsen_quantum_2010}]} \\
 \subsection{Calderbank-Shor-Steane Codes}
 \label{subsec:Calderbank-Shor-Steane Codes}
 
+% Intro
+
 Stabilizer codes are especially practical to work with when they can
-handle $X$- and $Z$-type errors independently.
-We can then separate the stabilizer generators into some with only
-$Z$ operators and some with only $X$ operators.
+handle $X$ and $Z$ type errors independently.
+As $Z$ errors anti-commute with $X$ operators in the stabilizers and
+vice versa, this property translates into being able to split the
+stabilizers into a subset being made up of only $X$
+operators and the rest only of $Z$ operators.
+We call such codes \ac{css} codes.
+We can see this property in \autoref{eq:steane} in the check matrix
+of the Steane code.
 
-\indent\red{[Z-type operators for X type errors and vice versa ]} \\
-\indent\red{[Construction from two binary linear codes
-\cite[p.~452,469]{nielsen_quantum_2010}]}
+% Construction
 
+We can exploit this separate consideration of $X$ and $Z$ errors in
+the construction of \ac{css} codes.
+We combine two binary linear codes $\mathcal{C}_1$ and
+$\mathcal{C}_2$, each responsible for correcting one type of error
+\cite[Sec.~10.5.6]{nielsen_quantum_2010}.
+Using the dual code of $\mathcal{C}_2$ \cite[Eq.~3.4]{ryan_channel_2009}
+\begin{align*}
+    \mathcal{C}_2^\perp := \left\{ \bm{x}' \in \mathbb{F}^2 :
+    \bm{x}' \bm{x}^\text{T} = 0 ~\forall \bm{x} \in \mathcal{C}_2 \right\}
+    ,%
+\end{align*}
+we define $\bm{H}_X := \bm{H}(\mathcal{C}_2^\perp)$ and $\bm{H}_Z
+:= \bm{H}(\mathcal{C}_1)$, and construct the check matrix as
+\begin{align*}
+    \left[
+        \begin{array}{c|c}
+            \bm{H}_X & \bm{0} \\
+            \bm{0} & \bm{H}_Z
+        \end{array}
+    \right]
+    .%
+\end{align*}
+In order to yield a valid stabilizer code, $\mathcal{C}_1$ and
+$\mathcal{C}_2$ must satisfy the commutativity condition
+\begin{align}
+    \label{eq:css_condition}
+    \bm{H}_X \bm{H}_Z^\text{T} = \bm{0}
+    .%
+\end{align}
+We can ensure this is the case by choosing them such that
+$\mathcal{C}_2 \subset \mathcal{C}_1$.
+
+%%%%%%%%%%%%%%%%
 \subsection{Quantum Low-Density Parity-Check Codes}
+\label{subsec:Quantum Low-Density Parity-Check Codes}
+
+% Intro
+
+Various methods of constructing \ac{qec} codes exist
+\cite{swierkowska_eccentric_2025}.
+Topological codes, for example, encode information in the features of
+a lattice and are intrinsically robust against local errors.
+Among these, the \emph{surface code} is the most widely studied.
+Another example are concatenated codes, which nest one code within
+another, allowing for especially simple and flexible constructions
+\cite[Sec.~3.2]{swierkowska_eccentric_2025}.
+An area of research that has recently seen more attention is that of
+quantum \ac{ldpc} (\acs{qldpc}) codes.
+They have much better encoding efficiency than, e.g., the surface
+code, scaling up of which would be prohibitively expensive
+\cite[Sec.~I]{bravyi_high-threshold_2024}.
+
+% Bivariate Bicycle codes
+
+A recent addition to the class of \ac{qldpc} codes is that of \ac{bb}
+codes \cite[Sec.~3]{bravyi_high-threshold_2024}.
+These are a special type of \ac{css} code, where $\bm{H}_X$ and
+$\bm{H}_Z$ are constructed from two matrices $\bm{A}$ and $\bm{B}$ as
+\begin{align*}
+    \bm{H}_X = [\bm{A} \vert \bm{B}]
+    \hspace*{5mm} \text{and} \hspace*{5mm}
+    \bm{H}_Z = [\bm{B}^\text{T} \vert \bm{A}^\text{T}]
+    .%
+\end{align*}
+This way, we can guarantee the satisfaction of the commutativity
+condition (\autoref{eq:css_condition}).
+To define $\bm{A}$ and $\bm{B}$ we first introduce some additional notation.
+We denote the identity matrix as $\bm{I_l} \in \mathbb{F}^{l\times l}$ and
+the \emph{cyclic shift matrix} as $\bm{S_l} \in \mathbb{F}^{l\times
+l},~S_{l,i,j}= \delta_{i+1,j}$, with $l \in \mathbb{N}$.
+We further define
+\begin{align*}
+    x = \bm{S}_l \otimes \bm{I}_m
+    \hspace*{5mm} \text{and} \hspace*{5mm}
+    y = \bm{I}_l \otimes \bm{S}_m
+    .%
+\end{align*}
+We can then construct $\bm{A}$ and $\bm{B}$ as bivariate polynomials
+\begin{align*}
+    \bm{A} = \bm{A}_1 + \bm{A}_2 + \bm{A}_3
+    \hspace*{5mm} \text{and} \hspace*{5mm}
+    \bm{B} = \bm{B}_1 + \bm{B}_2 + \bm{B}_3
+    ,%
+\end{align*}
+where $\bm{A}_i$ and $\bm{B}_i$ are powers of $\bm{x}$ or $\bm{y}$.
+\ac{bb} codes have large minimum distance $d_\text{min}$ and high rate,
+offering a more than 10-fold reduction of encoding overhead over the
+surface code.
+Additionally, they posess short-depth syndrome measurement circuits,
+leading to lower time requirements for the syndrome extraction
+and thus lower error rates \cite[Sec.~1]{bravyi_high-threshold_2024}.
+
+% Syndrome-based BP
+
+As we saw in \autoref{subsec:Stabilizer Measurements}, we work only
+with the parity information contained in the syndrome, to avoid
+disturbing the quantum states of individual qubits.
+This necessitates a modification of the standard \ac{bp} algorithm
+introduced in \autoref{subsec:Iterative Decoding}
+\cite[Sec.~3.1]{yao_belief_2024}.
+Instead of attempting to find the most likely codeword directly, the
+algorithm will now try to find an error pattern $\hat{\bm{e}} \in
+\mathbb{F}_2^n$ that satisfies
+\begin{align*}
+    \bm{H} \hat{\bm{e}}^\text{T} = \bm{s}
+    .%
+\end{align*}
+To this end, we initialize the channel \acp{llr} as
+\begin{align*}
+    \tilde{L}_i = \log{\frac{P(X_i = 0)}{P(X_i = 1)}} = \log{\frac{1
+    - p_i}{p_i}}
+    ,%
+\end{align*}
+where $p_i$ is the prior probability of error of \ac{vn} $i$.
+Additionally, we amend the \ac{cn} update to consider the parity
+indicated by the syndrome, calculating
+\begin{align*}
+    L_{i\leftarrow j} = 2\cdot (-1)^{s_j} \cdot \tanh^{-1} \left( \prod_{i'\in
+    \mathcal{N}(j)\setminus \{i\}} \tanh \frac{L_{i'\rightarrow j}}{2} \right)
+    .
+\end{align*}
+The resulting syndrome-based \ac{bp} algorithm is shown in
+algorithm \ref{alg:syndome_bp}.
 
-\noindent\red{[Constant overhead scaling]} \\
-\noindent\red{[Scaling of minimum distance with code length]} \\
-\noindent\red{[Bivariate Bicycle codes]} \\
-\noindent\red{[Decoding QLDPC codes (syndrome-based BP)]} \\
-\noindent\red{[Degeneracy -> BP+OSD, BPGD]} \\
-\noindent\red{[``The task of decoding is therefore to infer, from a
-        measured syndrome, the most likely error coset rather than the exact
-        physical error.''
 % tex-fmt: off
-\cite[Sec.~II~B)]{koutsioumpas_colour_2025}]}%
+\tikzexternaldisable
+\begin{algorithm}[t]
+    \caption{Binary syndrome-based belief propagation (BP) algorithm.}
+    \label{alg:syndome_bp}
+    \begin{algorithmic}[1]
+        \State \textbf{Initialize:} $\tilde{L}_i \leftarrow
+               \log \frac{1-p_i}{p_i}$ for all $i \in \mathcal{I}$
+        \State \textbf{Initialize:} $L_{i \rightarrow j} \leftarrow
+               \tilde{L}_i$ for all $i \in \mathcal{I},\, j \in \mathcal{N}_\text{V}(i)$
+        \State \textbf{Initialize:} $\hat{e} \leftarrow \bm{0}$
+
+        \For{$\ell = 1, \ldots, n_\text{iter}$}
+
+            \For{$j \in \mathcal{J}$}
+                \For{$i \in \mathcal{N}_\text{C}(j)$}
+                    \State $\displaystyle L_{i \leftarrow j} \leftarrow
+                           2\cdot(-1)^{s_j}\cdot\tanh^{-1}
+                           \!\left(
+                               \prod_{i' \in \mathcal{N}_\text{C}(j)\setminus\{i\}}
+                               \tanh\frac{L_{i'\rightarrow j}}{2}
+                           \right)$
+                \EndFor
+            \EndFor
+
+            \For{$i \in \mathcal{I}$}
+                \For{$j \in \mathcal{N}_\text{V}(i)$}
+                    \State $\displaystyle L_{i \rightarrow j} \leftarrow
+                           \tilde{L}_i +
+                           \sum_{j' \in \mathcal{N}_\text{V}(i)\setminus\{j\}}
+                           L_{i \leftarrow j'}$
+                \EndFor
+            \EndFor
+
+            \For{$i \in \mathcal{I}$}
+                \State $\displaystyle \hat{e}_i \leftarrow
+                       \mathbbm{1}\left\{
+                           \tilde{L}_i +
+                           \sum_{j \in \mathcal{N}_\text{V}(i)} L_{i \leftarrow j} < 0
+                       \right\}$
+            \EndFor
+
+            \If{$\bm{H}\hat{\bm{e}}^\text{T} = \bm{s}$}
+            \State \textbf{break}
+            \EndIf
+
+        \EndFor
+        \State \textbf{return} $\hat{\bm{e}}$
+    \end{algorithmic}
+\end{algorithm}
+\tikzexternalenable
 % tex-fmt: on
-        \\
 
-        \red{
-            \textbf{General Notes:}
-            \begin{itemize}
-                \item Note that there are other codes than stabilizer codes
-                    (and research and give some examples), but only
-                    stabilizer codes are considered in this work
-                \item Degeneracy
-                \item The QEC decoding problem (considering degeneracy)
-                    \cite[Sec.~2.3]{yao_belief_2024}
-            \end{itemize}
-            \textbf{Content:}
-            \begin{itemize}
-                \item  General context
-                    \begin{itemize}
-                        \item Why we need QEC (correcting errors due
-                            to noisy gates)
-                        \item Main challenges of QEC compared to classical
-                            error correction
-                        \item Logical vs physical states, logical vs
-                            physical operators
-                    \end{itemize}
-                \item Stabilizer codes
-                    \begin{itemize}
-                        \item Definition of a stabilizer code
-                        \item The stabilizer its generators (note somewhere
-                                that the generators have to commute
-                                to be able to
-                            be measured without disturbing each other)
-                            (Why we need commutativity of the
-                                stabilizers [Journal,
-                            p.~51], [Got97, p.~6])
-                        \item syndrome extraction circuit
-                        \item Stabilizer codes are effectively the QM
-                            % TODO: Actually binary linear codes or
-                            % just linear codes?
-                            equivalent of binary linear codes (e.g.,
-                            expressible via check matrix)
-                        \item Similar to parity checks, quantum states can be
-                            more conveniently described using stabilizers
-                            rather than working with the states directly
-                            \cite[Sec.~10.5.1]{nielsen_quantum_2010}
-                    \end{itemize}
-                \item Digitization of errors
-                \item CSS codes
-                \item Color codes?
-                \item Surface codes?
-            \end{itemize}
-        }
+% Degeneracy and short cycles
+
+Decoding \ac{qldpc} codes poses some unique challenges.
+One issue is that of \emph{quantum degeneracy}.
+Because errors that differ by a stabilizer have the same impact on
+all codewords, there can be multiple minimum-weight solutions to the
+quantum decoding problem \cite[Sec.~II.C.]{babar_fifteen_2015}
+\cite[Sec.~V]{roffe_decoding_2020}.
+This leads to the decoding algorithm getting confused about the
+direction to proceed in \cite[Sec.~5]{yao_belief_2024}.
+Another problem is that due to the commutativity property of the stabilizers,
+quantum codes inherently contain short cycles
+\cite[Sec.~IV.C]{babar_fifteen_2015}.
+As discussed in \autoref{subsec:Iterative Decoding}, these lead to
+the violation of the independence assumption of the messages passed
+during decoding, impeding performance.
+
+% BPGD
+
+The aforementioned issues both manifest themselves as convergence problems
+of the \ac{bp} algorithm, and different ways of modifying the algorithm
+to aid with convergence exist.
+One approach is to use \ac{bp} with guided decimation (\acs{bpgd})
+\cite[Alg.~1]{yao_belief_2024}.
+Here, a number $T\in \mathbb{N}$ of \ac{bp} iterations are performed,
+before \emph{decimating} the most reliable \ac{vn}, i.e., performing
+a hard decision and excluding it from further decoding.
+This constrains the solution space more and more as the decoding
+progresses, encouraging the algorithm to converge to one of the
+solutions \cite[Sec.~5]{yao_belief_2024}.
+Algorithm \ref{alg:bpgd} shows this process.
+Note that as the Tanner graph only has $n$ \acp{vn}, this is a
+natural constraint on the maximum number of outer iterations of the algorithm.
+
+% TODO: Explain that setting the channel LLR to infinity is the same
+% as a hard decision and ignoring the VN in the further decoding
+% tex-fmt: off
+\tikzexternaldisable
+\begin{algorithm}[t]
+    \caption{Belief propagation with guided decimation (BPGD) algorithm.}
+    \label{alg:bpgd}
+    \begin{algorithmic}[1]
+        \State \textbf{Initialize:} $\tilde{L}_i \leftarrow
+               \log \frac{1-p_i}{p_i}$ for all $i \in \mathcal{I}$
+        \State \textbf{Initialize:} $L_{i \rightarrow j} \leftarrow
+               \tilde{L}_i$ for all $i \in \mathcal{I},\, j \in \mathcal{N}_\text{V}(i)$
+        \State \textbf{Initialize:} $\hat{e} \leftarrow \bm{0}$
+        \State \textbf{Initialize:} $\mathcal{I}' \leftarrow \mathcal{I}$
+
+        \For{$r = 1, \ldots, n$}
+
+            \For{$\ell = 1, \ldots, T$}
+                \State Perform \ac{cn} update
+                \State Perform \ac{vn} update
+                \State  $L^\text{total}_i \leftarrow \tilde{L}_i + \sum_{j \in \mathcal{N}_\text{V}(i)} L_{i \leftarrow j}$
+            \EndFor
+
+            \For{$i \in \mathcal{I}$}
+                \State $\displaystyle \hat{e}_i \leftarrow
+                       \mathbbm{1}\left\{ L^\text{total}_i \right\}$
+            \EndFor
+
+            \If{$\bm{H}\hat{\bm{e}}^\text{T} = \bm{s}$}
+                \State \textbf{break}
+            \Else
+                \State $i_\text{max} \leftarrow \argmax_{i \in \mathcal{I}'} \lvert L^\text{total}_i \rvert $
+                \If{$L^\text{total}_{i_\text{max}} < 0$}
+                    \State $\tilde{L}_{i_\text{max}} \leftarrow -\infty$
+                \Else
+                    \State $\tilde{L}_{i_\text{max}} \leftarrow +\infty$
+                \EndIf
+                \State $\mathcal{I}' \leftarrow \mathcal{I}'\setminus\{i_\text{max}\}$
+            \EndIf
+
+        \EndFor
+        \State \textbf{return} $\hat{\bm{e}}$
+    \end{algorithmic}
+\end{algorithm}
+\tikzexternalenable
+% tex-fmt: on
 

src/thesis/chapters/3_fault_tolerant_qec.tex

@@ -1,18 +1,643 @@
+% TODO: Make all [H] -> [t]
 \chapter{Fault Tolerant QEC}
-\section{Fault Tolerance}
+
+% Intro
+
+\content{Syndrome extraction circuitry itself introduces errors}
+\content{High level explanation of fault tolerance (with figure)}
+\content{Mathematical definition of fault tolerance}
+
+% Practical considerations
+
+\content{We generally need to perform multiple rounds of syndrome extraction}
+\content{The number of rounds of syndrome extraction is usually
+chosen equal to the $d_\text{min}$ of the code}
+\content{One-shot decoding property}
+
+\begin{figure}[H]
+    \centering
+
+    \begin{tikzpicture}
+        \node[rectangle, draw, fill=orange!20, minimum
+        height=2cm, minimum width=2.5cm, align=left] at (0,0)
+        (internal) {Internal\\ Errors};
+
+        \node[signal, draw, fill=orange!20, minimum height=2cm,
+        minimum width=2.5cm, align=left, signal pointer angle=140]
+        at (-2.45, 0) (input) {Input\\ Errors};
+
+        \node at (1.97,0) {\huge =};
+
+        \node[rectangle, draw, fill=orange!20, minimum height=2cm,
+        minimum width=2.5cm, align=left] at (4,0) (output)
+        {Output\\ Errors};
+
+        \node[above] at (input.north) {\small Input State};
+        \node[above] at (internal.north) {\small QEC};
+        \node[above] at (output.north) {\small Output State};
+    \end{tikzpicture}
+
+    \caption{Sources of error in a fault-tolerant \ac{qec} system.}
+\end{figure}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \section{Noise Models}
-\subsection{Depolarizing Channel}
-\subsection{Phenomenological Noise}
-\subsection{Circuit-Level Noise}
+\label{sec:Noise Models}
+
+% Intro
+
+\content{Explanation of what a noise model is}
+\content{Mention there are different types of noise models, each with
+different possible error locations}
+
+% Figure intro
+
+\content{\autoref{fig:pure_syndrome_extraction} shows the syndrome
+    extraction circuit of a three-qubit repetition code with stabilizers
+    $Z_1Z_2$ and $Z_2Z_3$. This code is only able to deal with X errors.
+    We will use it as a propotypical model to examine the different types
+of noise models}
+\content{This is now a concrete implementation of the syndrome
+    measurement circuit using CNOT gates, as opposed to the system-level
+view in \autoref{subsec:Stabilizer Codes}}
+\content{\autoref{fig:noise_model_types} shows a number of diffent
+types of noise models}
+
+% Bit-flip noise
+
+\content{Bit-flip noise}
+\content{Introduce \emph{data qubits}}
+\content{Only X errors on data qubits}
+\content{Most similar to classical channel coding}
+\content{\textbf{TODO}: What is this useful for? Just as a first step?}
+
+% Depolarizing channel
+
+\content{Depolarizing channel}
+\content{X/Y/Z errors on data qubits}
+\content{\textbf{TODO}: What does this model? Memory experiment with
+ideal syndrome extraction?}
+\content{\textbf{TODO}: Why is it called depolarizing?}
+
+% Phenomenological noise
+
+\content{Phenomenological noise}
+\content{First noise model that considers errors during syndrome extraction}
+\content{X errors before each syndrome extraction round}
+\content{X errors before measurements}
+\content{\textbf{TODO}: Why is this useful? Derks et al. mentioned
+something about it being useful to derive fault-tolerant circuits}
+\content{\textbf{TODO}: Make sure phenomenological noise is only X errors}
+
+% Circuit-level noise
+
+\content{Circuit-level noise}
+\content{This is generally what we strive to be able to decode under}
+\content{X/Y/Z errors before each syndrome extraction round}
+\content{$n$-qubit Pauli errors after each $n$-qubit Pauli gate}
+\content{Define $n$-qubit Pauli errors}
+\content{X errors right before the measurements}
+\content{Note that the only errors right before the measurements that
+    have any effect on the measurement outcomes are X errors. That is why
+it is enough to consider this type of error at this point in the circuit.}
+
+% Different noise models for circuit-level noise
+
+\content{Comparison from Gidney's paper}
+\content{In this work we only consider standard circuit-based
+depolarizing noise}
+
+\begin{figure}[H]
+    \centering
+
+    \begin{minipage}{0.5\textwidth}
+        \begin{align*}
+            \bm{H} =
+            \begin{pmatrix}
+                1 & 1 & 0 \\
+                0 & 1 & 1
+            \end{pmatrix}
+        \end{align*}
+    \end{minipage}%
+    \begin{minipage}{0.5\textwidth}
+        % tex-fmt: off
+        \begin{quantikz}%[row sep=4mm, column sep=4mm]
+            \lstick[3]{$\ket{\psi}_\text{L}$} & \ctrl{3} &          &          &          &           &                 \\
+                                              &          & \ctrl{2} & \ctrl{3} &          &           &                 \\
+                                              &          &          &          & \ctrl{2} &           &                 \\
+            \lstick{$\ket{0}_{\text{A}_1}$}   & \targ{}  & \targ{}  &          &          &  \meter{} & \setwiretype{c} \\
+            \lstick{$\ket{0}_{\text{A}_2}$}   &          &          & \targ{}  & \targ{}  &  \meter{} & \setwiretype{c}
+        \end{quantikz}
+        % tex-fmt: on
+    \end{minipage}%
+
+    \caption{
+        Syndrome extraction circuit for the three-qubit repetition
+        code under bit-flip noise.
+    }
+    \label{fig:pure_syndrome_extraction}
+\end{figure}
+
+\begin{figure}[H]
+    \centering
+
+    \newcommand{\xerr}{\gate[style={fill=KITblue!50}]{\phantom{1}}}
+    \newcommand{\xyzerr}{\gate[style={
+                draw=black,
+                fill=KITred,
+                path picture={
+                    % tex-fmt: off
+                    \fill[KITblue!60]
+                    ($(path picture bounding box.south west)+(0,0)$)
+                    -- ($(path picture bounding box.north west)+(0,0)$)
+                    -- ($(path picture bounding box.north west)+(0.28,0)$)
+                    -- cycle;
+                    \fill[KITorange!60]
+                    ($(path picture bounding box.north east)+(0,0)$)
+                    -- ($(path picture bounding box.south east)+(0,0)$)
+                    -- ($(path picture bounding box.south east)+(-0.28,0)$)
+                    -- cycle;
+                    \fill[KITred!60]
+                    ($(path picture bounding box.north east)+(0,0)$)
+                    -- ($(path picture bounding box.south east)+(-0.28,0)$)
+                    -- ($(path picture bounding box.south west)+(0,0)$)
+                    -- ($(path picture bounding box.north west)+(0.28,0)$)
+                    -- cycle;
+                    % tex-fmt: on
+                }
+    }]{\phantom{1}}}
+
+    \begin{minipage}{0.7\textwidth}
+        \begin{minipage}{\textwidth}
+            \centering
+            % tex-fmt: off
+            \begin{quantikz}[row sep=4mm, column sep=4mm]
+                \lstick[3]{$\ket{\psi}_\text{L}$}        & \xerr & \ctrl{3} &            &          &           &           &                 \\
+                                                & \xerr &          & \ctrl{2}   & \ctrl{3} &           &           &                 \\
+                                                & \xerr &          &            &          & \ctrl{2}  &           &                 \\
+                \lstick{$\ket{0}_{\text{A}_1}$} &       & \targ{}  & \targ{}    &          &           &  \meter{} & \setwiretype{c} \\
+                \lstick{$\ket{0}_{\text{A}_2}$} &       &          &            & \targ{}  & \targ{}   &  \meter{} & \setwiretype{c}
+            \end{quantikz}
+            % tex-fmt: on
+
+            \subcaption{Bit-flip noise.}
+        \end{minipage}
+
+        \vspace*{5mm}
+
+        \begin{minipage}{\textwidth}
+            \centering
+            % tex-fmt: off
+            \begin{quantikz}[row sep=4mm, column sep=4mm]
+                \lstick[3]{$\ket{\psi}_\text{L}$} & \xyzerr & \ctrl{3} &            &          &           &           &                 \\
+                                                  & \xyzerr &          & \ctrl{2}   & \ctrl{3} &           &           &                 \\
+                                                  & \xyzerr &          &            &          & \ctrl{2}  &           &                 \\
+                \lstick{$\ket{0}_{\text{A}_1}$}   &         & \targ{}  & \targ{}    &          &           &  \meter{} & \setwiretype{c} \\
+                \lstick{$\ket{0}_{\text{A}_2}$}   &         &          &            & \targ{}  & \targ{}   &  \meter{} & \setwiretype{c}
+            \end{quantikz}
+            % tex-fmt: on
+
+            \subcaption{Depolarizing channel.}
+        \end{minipage}
+
+        \vspace*{5mm}
+
+        \begin{minipage}{\textwidth}
+            \centering
+            % tex-fmt: off
+            \begin{quantikz}[row sep=4mm, column sep=4mm]
+                \lstick[3]{$\ket{\psi}_\text{L}$} & \xerr & \ctrl{3} &           &          &          &       &           & \xerr            & & \setwiretype{n} &                                       \\
+                                                  & \xerr &          & \ctrl{2}  & \ctrl{3} &          &       &           & \xerr            & & \setwiretype{n} & \gate[style={left,draw=none}]{\cdots} \\
+                                                  & \xerr &          &           &          & \ctrl{2} &       &           & \xerr            & & \setwiretype{n} &                                       \\
+                \lstick{$\ket{0}_{\text{A}_1}$}   &       & \targ{}  & \targ{}   &          &          & \xerr &  \meter{} & \setwiretype{c}                                                              \\
+                \lstick{$\ket{0}_{\text{A}_2}$}   &       &          &           & \targ{}  & \targ{}  & \xerr &  \meter{} & \setwiretype{c}
+            \end{quantikz}
+            % tex-fmt: on
+
+            \subcaption{Phenomenological noise.}
+        \end{minipage}
+
+        \vspace*{5mm}
+
+        \begin{minipage}{\textwidth}
+            \centering
+            % tex-fmt: off
+            \begin{quantikz}[row sep=4mm, column sep=2mm]
+                \lstick[3]{$\ket{\psi}_\text{L}$} & \xyzerr & \ctrl{3} & \xyzerr \wire[d][3]{q} &           &                        &          &                        &          &                        &       &           & \xyzerr          & & \setwiretype{n} &                                                    \\
+                                                  & \xyzerr &          &                        & \ctrl{2}  & \xyzerr \wire[d][2]{q} & \ctrl{3} & \xyzerr \wire[d][3]{q} &          &                        &       &           & \xyzerr          & & \setwiretype{n} & \gate[style={left,draw=none,xshift=3.5mm}]{\cdots} \\
+                                                  & \xyzerr &          &                        &           &                        &          &                        & \ctrl{2} & \xyzerr \wire[d][2]{q} &       &           & \xyzerr          & & \setwiretype{n} &                                                    \\
+                \lstick{$\ket{0}_{\text{A}_1}$}   & \xyzerr & \targ{}  & \xyzerr                & \targ{}   & \xyzerr                &          &                        &          &                        & \xerr &  \meter{} & \setwiretype{c}                                                                           \\
+                \lstick{$\ket{0}_{\text{A}_2}$}   & \xyzerr &          &                        &           &                        & \targ{}  & \xyzerr                & \targ{}  & \xyzerr                & \xerr &  \meter{} & \setwiretype{c}
+            \end{quantikz}
+            % tex-fmt: on
+
+            \subcaption{Circuit-level noise.}
+        \end{minipage}
+    \end{minipage}%
+    \hfill%
+    \begin{minipage}{0.23\textwidth}
+        \centering
+        % tex-fmt: off
+        \begin{quantikz}[row sep=4mm, column sep=2mm]
+            \setwiretype{n} & \xerr                            & \gate[style={right, draw=none, xshift=-15mm}]{\text{X error}}            \\
+            \setwiretype{n} & \xyzerr                          & \gate[style={right, draw=none, xshift=-15mm}]{\text{X,Z, or Y error}}    \\
+            \setwiretype{n} & \gate{\phantom{1}}\wire[d][1]{q} & \gate[style={right, draw=none, xshift=-15mm},2]{\text{Correlated error}} \\
+            \setwiretype{n} & \gate{\phantom{1}}               &
+        \end{quantikz}
+        % tex-fmt: on
+    \end{minipage}
+
+    \caption{Types of noise models.}
+    \label{fig:noise_model_types}
+\end{figure}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \section{Detector Error Models}
+\label{sec:Detector Error Models}
+
+\content{\textbf{TODO}: Look up how Derks et al. introduce DEMs}
+
+% Different ways of implementing fault tolerance
+
+\content{Ways of implementing fault tolerance different from DEMs}
+
+% Core idea
+
+\content{Model additional error locations in the code}
+\content{Construct ``circuit code'' from original code}
+
+% Benefits
+
+\content{Benefits of this approach}
+
+%%%%%%%%%%%%%%%%
 \subsection{Measurement Syndrome Matrix}
+\label{subsec:Measurement Syndrome Matrix}
+
+% Core idea
+
+\content{Core idea: Matrix describes parity checks \\
+    $\rightarrow$ A column shows which parity checks the
+    corresponding VN contributes to \\
+    $\rightarrow$ View columns as syndromes corresponding to error
+    locations in the circuit
+}
+
+% Multiple rounds of syndrome extraction
+
+% TODO: First introduce syndrome measurement matrix, mathematically
+% (consult Derks et al.'s paper). Then use the three-qubit repetition
+% code as an example only
+\autoref{fig:rep_code_multiple_rounds_bit_flip} shows a circuit
+performing three rounds of syndrome extraction for the three-qubit
+repetition code introduced earlier.
+We are only considering bit-flip noise at this point.
+For each syndrome extraction round, we get an additional set of
+syndrome measurements.
+We combine these measurements by stacking them in a new vector $\bm{s}
+\in \mathbb{F}_2^{n_\text{rounds}\cdot(n-k)}$.
+To model this behavior mathematically, we append additional rows to
+the check matrix.
+We call this matrix the \emph{measurement syndrome matrix}
+$\bm{\Omega}$.
+
+\begin{figure}[H]
+    \centering
+
+    \begin{minipage}{0.3\textwidth}
+        \centering
+        \begin{tikzpicture}
+            \node{$%
+                \bm{\Omega} =
+                \begin{pmatrix}
+                    1 & 1 & 0 \\
+                    0 & 1 & 1 \\
+                    1 & 1 & 0 \\
+                    0 & 1 & 1 \\
+                    1 & 1 & 0 \\
+                    0 & 1 & 1
+                \end{pmatrix}%
+                $
+            };
+
+            \draw [
+                line width=1pt,
+                decorate,
+                decoration={brace,mirror,amplitude=3mm,raise=5mm}
+            ]
+            (1,0.55) -- (1,1.4)
+            node[midway,right,xshift=10mm]{$\text{SE}_1$};
+
+            \draw [
+                line width=1pt,
+                decorate,
+                decoration={brace,mirror,amplitude=3mm,raise=5mm}
+            ]
+            (1,-0.4) -- (1,0.45)
+            node[midway,right,xshift=10mm]{$\text{SE}_2\hspace{2mm},$};
+
+            \draw [
+                line width=1pt,
+                decorate,
+                decoration={brace,mirror,amplitude=3mm,raise=5mm}
+            ]
+            (1,-1.38) -- (1,-0.5)
+            node[midway,right,xshift=10mm]{$\text{SE}_3$};
+        \end{tikzpicture}
+    \end{minipage}%
+    \begin{minipage}{0.3\textwidth}
+        \centering
+        \vspace*{-6mm}
+        \begin{gather*}
+            \bm{s} \in \text{span} \mleft\{ \bm{\Omega} \mright\}
+        \end{gather*}
+    \end{minipage}
+
+    \newcommand{\preperr}[1]{
+        \gate[style={fill=blue!20}]{\scriptstyle #1}
+    }
+
+    \vspace*{5mm}
+
+    \begin{quantikz}[
+            row sep=4mm, column sep=4mm,
+            wire types={q,q,q,q,q,n,n,n,n},
+            execute at end picture={
+                \draw [
+                    line width=1pt,
+                    decorate,
+                    decoration={brace,amplitude=3mm,raise=9mm}
+                ]
+                (\tikzcdmatrixname-4-19.north east)
+                --
+                (\tikzcdmatrixname-5-19.south east)
+                node[midway,right,xshift=14mm]{$\text{SE}_1$};
+                \draw [
+                    line width=1pt,
+                    decorate,
+                    decoration={brace,amplitude=3mm,raise=9mm}
+                ]
+                (\tikzcdmatrixname-6-19.north east)
+                --
+                (\tikzcdmatrixname-7-19.south east)
+                node[midway,right,xshift=14mm]{$\text{SE}_2$};
+                \draw [
+                    line width=1pt,
+                    decorate,
+                    decoration={brace,amplitude=3mm,raise=9mm}
+                ]
+                (\tikzcdmatrixname-8-19.north east)
+                --
+                (\tikzcdmatrixname-9-19.south east)
+                node[midway,right,xshift=14mm]{$\text{SE}_3$};
+            }
+        ]
+            % tex-fmt: off
+            \lstick[3]{$\ket{\psi}_\text{L}$}        & \preperr{E_0} & \ctrl{3} &           &          &          &                                 &                 & \ctrl{5} &           &          &          &                                 &                 & \ctrl{7} &           &          &          &           &                 \\
+                                            & \preperr{E_1} &          & \ctrl{2}  & \ctrl{3} &          &                                 &                 &          &  \ctrl{4} & \ctrl{5} &          &                                 &                 &          & \ctrl{6}  & \ctrl{7} &          &           &                 \\
+                                            & \preperr{E_2} &          &           &          & \ctrl{2} &                                 &                 &          &           &          & \ctrl{4} &                                 &                 &          &           &          & \ctrl{6} &           &                 \\
+            \lstick{$\ket{0}_{\text{A}_1}$} &               & \targ{}  & \targ{}   &          &          &                                 &                 &          &           &          &          &                                 &                 &          &           &          &          &  \meter{} & \setwiretype{c} \\
+            \lstick{$\ket{0}_{\text{A}_2}$} &               &          &           & \targ{}  & \targ{}  &                                 &                 &          &           &          &          &                                 &                 &          &           &          &          &  \meter{} & \setwiretype{c} \\
+                                            &               &          &           &          &          & \lstick{$\ket{0}_{\text{A}_3}$} & \setwiretype{q} & \targ{}  &  \targ{}  &          &          &                                 &                 &          &           &          &          &  \meter{} & \setwiretype{c} \\
+                                            &               &          &           &          &          & \lstick{$\ket{0}_{\text{A}_4}$} & \setwiretype{q} &          &           &  \targ{} & \targ{}  &                                 &                 &          &           &          &          &  \meter{} & \setwiretype{c} \\
+                                            &               &          &           &          &          &                                 &                 &          &           &          &          & \lstick{$\ket{0}_{\text{A}_5}$} & \setwiretype{q} & \targ{}  &  \targ{}  &          &          &  \meter{} & \setwiretype{c} \\
+                                            &               &          &           &          &          &                                 &                 &          &           &          &          & \lstick{$\ket{0}_{\text{A}_6}$} & \setwiretype{q} &          &           &  \targ{} & \targ{}  &  \meter{} & \setwiretype{c}
+            % tex-fmt: on
+    \end{quantikz}
+
+    \caption{
+        Repeated syndrome extraction circuit for the three-qubit
+        repetition code under bit flip noise.
+    }
+    \label{fig:rep_code_multiple_rounds_bit_flip}
+\end{figure}
+
+\begin{figure}[H]
+    \begin{gather*}
+        \hspace*{-33.3mm}%
+        \begin{array}{c}
+            E_6 \\
+            \downarrow
+        \end{array}
+    \end{gather*}
+    \vspace*{-8mm}
+    \begin{gather*}
+        \bm{\Omega} =
+        \left(
+            \begin{array}{
+                    cccccc%
+                    >{\columncolor{red!20}}c%
+                    cccccccc
+                }
+                1 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 0 & 0
+                & 0 & 0 & 0 & 0 & 0  \\
+                0 & 1 & 1 & 0 & 1 & 0 & 0 & 0 & 0 & 0
+                & 0 & 0 & 0 & 0 & 0  \\
+                1 & 1 & 0 & 0 & 0 & 1 & 1 & 0 & 1 & 0
+                & 0 & 0 & 0 & 0 & 0  \\
+                0 & 1 & 1 & 0 & 0 & 0 & 1 & 1 & 0 & 1
+                & 0 & 0 & 0 & 0 & 0  \\
+                1 & 1 & 0 & 0 & 0 & 1 & 1 & 0 & 0 & 0
+                & 1 & 1 & 0 & 1 & 0  \\
+                0 & 1 & 1 & 0 & 0 & 0 & 1 & 1 & 0 & 0
+                & 0 & 1 & 1 & 0 & 1
+            \end{array}
+        \right),
+        \hspace*{7mm}
+        \bm{s} \in \text{span} \mleft\{
+        \bm{\Omega} \mright\}
+    \end{gather*}
+
+    \vspace*{5mm}
+
+    \newcommand{\preperr}[1]{
+        \gate[style={fill=blue!20}]{\scriptstyle #1}
+    }
+    \newcommand{\measerr}{\gate[style={fill=blue!20}]{\phantom{1}}}
+
+    \newcommand{\noise}{
+        \gate[style={noisy}]{\text{\small X}}%
+        \setwiretype{n}%
+        \wire[l][1]{q}
+    }
+    \newcommand{\redwire}[1]{
+        \wire[r][#1][style={draw=red, line width=1.5pt}]{q}
+    }
+    \newcommand{\redtarg}{
+        \targ[style={draw=red}]{}%
+        \setwiretype{n}%
+        \wire[l][1]{q}
+    }
+    \newcommand{\redctrl}[1]{
+        \ctrl[style={draw=red,fill=red,line width=1.5pt}]{#1}
+    }
+    \newcommand{\redmeter}{\meter[style={draw=red,fill=red!20}]{}}
+
+    \tikzset{
+        noisy/.style={
+            starburst,
+            starburst point height=2.5mm,
+            fill=red!25, draw=red!85!black,
+            line width=1.5pt,
+            inner xsep=-2pt, inner ysep=-2pt
+        },
+    }
+
+    \centering
+
+    % tex-fmt: off
+    \begin{quantikz}[row sep=4mm, column sep=3mm, wire types={q,q,q,q,q,n,n,n,n}]
+        \lstick[3]{$\ket{\psi}_\text{L}$} & \preperr{E_0}         & \ctrl{3} &           &          &          & \preperr{E_5}                   &                 & \ctrl{5} &                      &                     &          & \preperr{E_{10}}                &                 & \ctrl{7} &                     &                     &          &                  &                                                                    &                 \\
+                                          & \preperr{E_1}         &          & \ctrl{2}  & \ctrl{3} &          & \noise\redwire{14}              &                 &          & \redctrl{4}          & \redctrl{5}         &          & \preperr{E_{11}}                &                 &          & \redctrl{6}         & \redctrl{7}         &          &                  &                                                                    &                 \\
+                                          & \preperr{E_2}         &          &           &          & \ctrl{2} & \preperr{E_7}                   &                 &          &                      &                     & \ctrl{4} & \preperr{E_{12}}                &                 &          &                     &                     & \ctrl{6} &                  &                                                                    &                 \\
+        \lstick{$\ket{0}_{\text{A}_1}$}   &                       & \targ{}  & \targ{}   &          &          &                                 &                 &          &                      &                     &          &                                 &                 &          &                     &                     &          & \preperr{E_3}    & \meter{}                                                           & \setwiretype{c} \\
+        \lstick{$\ket{0}_{\text{A}_2}$}   &                       &          &           & \targ{}  & \targ{}  &                                 &                 &          &                      &                     &          &                                 &                 &          &                     &                     &          & \preperr{E_4}    & \meter{}                                                           & \setwiretype{c} \\
+                                          &                       &          &           &          &          & \lstick{$\ket{0}_{\text{A}_3}$} & \setwiretype{q} & \targ{}  & \redtarg\redwire{10} &                     &          &                                 &                 &          &                     &                     &          & \preperr{E_8}    & \redmeter\wire[r][1][style={draw=red,double, line width=1.5pt}]{q} & \setwiretype{n} \\
+                                          &                       &          &           &          &          & \lstick{$\ket{0}_{\text{A}_4}$} & \setwiretype{q} &          &                      & \redtarg\redwire{9} & \targ{}  &                                 &                 &          &                     &                     &          & \preperr{E_9}    & \redmeter\wire[r][1][style={draw=red,double, line width=1.5pt}]{q} & \setwiretype{n} \\
+                                          &                       &          &           &          &          &                                 &                 &          &                      &                     &          & \lstick{$\ket{0}_{\text{A}_5}$} & \setwiretype{q} & \targ{}  & \redtarg\redwire{4} &                     &          & \preperr{E_{13}} & \redmeter\wire[r][1][style={draw=red,double, line width=1.5pt}]{q} & \setwiretype{n} \\
+                                          &                       &          &           &          &          &                                 &                 &          &                      &                     &          & \lstick{$\ket{0}_{\text{A}_6}$} & \setwiretype{q} &          &                     & \redtarg\redwire{3} & \targ{}  & \preperr{E_{14}} & \redmeter\wire[r][1][style={draw=red,double, line width=1.5pt}]{q} & \setwiretype{n}
+    \end{quantikz}
+    % tex-fmt: on
+
+    \caption{
+        Repeated syndrome extraction circuit for the three-qubit
+        repetition code under phenomenological noise.
+    }
+\end{figure}
+
+%%%%%%%%%%%%%%%%
 \subsection{Detector Error Matrix}
+\label{subsec:Detector Error Matrix}
+
+% Core idea
+
+% TODO: Make this a proper definition?
+Instead of using the measurements as parity indicators directly, we
+may wish to combine them in some way.
+We call such combinations \emph{detectors}.
+Formally, a detector is a parity constraint on a set of measurement
+outcomes \cite[Def.~2.1]{derks_designing_2025}.
+
+\content{Detector matrix}
+
+\content{Detector error matrix}
+
+\content{One way of defining the detectors is ...}
+
+\begin{figure}[H]
+    \centering
+
+    \tikzset{
+        gate/.style={
+            draw, %line width=1pt,
+            minimum height=2cm,
+        }
+    }
+
+    % tex-fmt: off
+    \begin{quantikz}[row sep=2mm, column sep=4mm, wire types={q,q,q,n,n,n}]
+        \lstick[3]{$\ket{\psi}_\text{L}$} & \gate[3]{\text{SE}_1}          &                & \gate[3]{\text{SE}_2}                   &                & \gate[3]{\text{SE}_3}                   &                & \gate[3]{\text{SE}_4}                   &                            \\
+                                          &                                &                &                                         &                &                                         &                &                                         & & \setwiretype{n} & \ldots \\
+                                          & \wire[d][3]{c}                 &                & \wire[d][1]{c}                          &                & \wire[d][1]{c}                          &                & \wire[d][1]{c}                          &                            \\
+                                          & \ctrl[wire=c]{0}\wire[r][1]{c} & \wire[d][1]{c} & \ctrl[vertical wire=c]{1}\wire[r][1]{c} & \wire[d][1]{c} & \ctrl[vertical wire=c]{1}\wire[r][1]{c} & \wire[d][1]{c} & \ctrl[vertical wire=c]{1}\wire[r][1]{c} &                            \\
+                                          &                                & \wire[r][1]{c} & \targ{}\wire[d][1]{c}                   & \wire[r][1]{c} & \targ{}\wire[d][1]{c}                   & \wire[r][1]{c} & \targ{}\wire[d][1]{c}                   &                            \\
+                                          & \gate[1]{\bm{D}_1}             &                & \gate[1]{\bm{D}_2}                      &                & \gate[1]{\bm{D}_3}                      &                & \gate[1]{\bm{D}_4}                      &                            \\
+    \end{quantikz}
+    % tex-fmt: on
+
+    \caption{Construction of detectors from measurements in the general case.}
+\end{figure}
+
+\content{The three-qubit repetition code as an exmaple}
+
+\begin{figure}[H]
+    \centering
+
+    \hspace*{-5mm}
+    \begin{minipage}{0.42\textwidth}
+        \newcommand{\redwire}[1]{
+            \wire[r][#1][style={draw=red, line width=1.5pt, double}]{q}
+        }
+        \newcommand{\inwire}{
+            \wire[l][1][style={draw=red, line width=1.5pt}]{q}
+        }
+        \newcommand{\redtarg}{
+            \targ[style={draw=red,line width=1.5pt}]{}%
+            \setwiretype{n}%
+        }
+        \newcommand{\redctrl}[1]{
+            \ctrl[style={draw=red,fill=red, line width=1.5pt}]{0}%
+            \wire[d][#1][style={draw=red, line width=1.5pt, double}]{q}
+        }
+        \newcommand{\redmeter}{\meter[style={draw=red,fill=red!20}]{}}
+        \newcommand{\redgate}[1]{\gate[style={draw=red,fill=red!20}]{\textcolor{red}{#1}}}
+
+        % tex-fmt: off
+        \begin{quantikz}[row sep=4mm, column sep=3mm, wire types={n,n,n,n,n,n}]
+            & \meter{}\wire[l][1]{q}\wire[r][1]{c} & \setwiretype{c}               &                           &             & \ctrl[vertical wire=c]{2} &                           & \gate{D_1} \\
+            & \meter{}\wire[l][1]{q}\wire[r][1]{c} & \setwiretype{c}               &                           &             &                           & \ctrl[vertical wire=c]{2} & \gate{D_2} \\
+            & \redmeter{}\inwire\redwire{6} &      & \redctrl{2}                   &                           & \targ{}     &                           & \redgate{D_3} \\
+            & \redmeter{}\inwire\redwire{6} &      &                               & \redctrl{2}               &             & \targ{}                   & \redgate{D_4} \\
+            & \redmeter{}\inwire\redwire{2} &      & \redtarg\wire[r][4]{c}        &                           &             &                           & \gate{D_5} \\
+            & \redmeter{}\inwire\redwire{3} &      &                               & \redtarg\wire[r][3]{c}    &             &                           & \gate{D_6}
+        \end{quantikz}
+        % tex-fmt: on
+    \end{minipage}%
+    \begin{minipage}{0.56\textwidth}
+        \newcommand\cc{\cellcolor{orange!20}}
+
+        \begin{align*}
+            \bm{H} =
+            % tex-fmt: off
+            \left(\begin{array}{ccccccccccccccc}
+                1      & 1      & 0      & 1      & 0      & 0      & 0      & 0      & 0      & 0      & 0 & 0 & 0 & 0 & 0  \\
+                0      & 1      & 1      & 0      & 1      & 0      & 0      & 0      & 0      & 0      & 0 & 0 & 0 & 0 & 0  \\
+                \cc{0} & \cc{0} & \cc{0} & \cc{1} & \cc{0} & 1      & 1      & 0      & 1      & 0      & 0 & 0 & 0 & 0 & 0  \\
+                \cc{0} & \cc{0} & \cc{0} & \cc{0} & \cc{1} & 0      & 1      & 1      & 0      & 1      & 0 & 0 & 0 & 0 & 0  \\
+                \cc{0} & \cc{0} & \cc{0} & \cc{0} & \cc{0} & \cc{0} & \cc{0} & \cc{0} & \cc{1} & \cc{0} & 1 & 1 & 0 & 1 & 0  \\
+                \cc{0} & \cc{0} & \cc{0} & \cc{0} & \cc{0} & \cc{0} & \cc{0} & \cc{0} & \cc{0} & \cc{1} & 0 & 1 & 1 & 0 & 1
+            \end{array}\right)
+            % tex-fmt: on
+        \end{align*}
+    \end{minipage}
+
+    \caption{Construction of detectors from the measurements of a
+    three-qubit repetition code.}
+    \label{fig:Construction of the detectors from the measurements}
+\end{figure}
+
+%%%%%%%%%%%%%%%%
 \subsection{Detector Error Models}
+\label{subsec:Detector Error Models}
+
+\content{Combination of detector error matrix and noise model}
+\content{Contains all information necessary for decoding
+\cite[Intro.]{derks_designing_2025}}
+\content{Not only useful for decoding, but also for ... (Derks et al.)}
+
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \section{Practical Considerations}
+\label{sec:Practical Considerations}
+
+% Intro
+
+\content{Intro}
+
+%%%%%%%%%%%%%%%%
 \subsection{Practical Methodology}
+\label{subsec:Practical Methodology}
 
-\indent\red{[(?) Figure from presentation, showing where the LER
-calculation takes place]} \\
+\content{Per-round-LER explanation}
 
+%%%%%%%%%%%%%%%%
 \subsection{Stim}
+\label{subsec:Stim}
+
+\content{Circuit code heavily depends on the exact circuit construction}
+\content{Not easy to predict how errors at different locations
+propagate through the circuit an what detectors they affect}
+
+\content{Stim is a software package that generates DEMs from circuits}
+\content{The user still has to define the circuit themselves, and
+especially the detectors \cite[Sec~2.5]{derks_designing_2025}}
 

src/thesis/clean_bibliography.sh

@@ -0,0 +1,2 @@
+sed -i "s/Świerkowska/{\\\\'S}wierkowska/" bibliography.bib
+sed -Ezi "s/\s(abstract|note|urldate|url|keywords|file) = \{[^}]*(\{[^}]*\}[^}]*)*\},?\n//g" bibliography.bib

src/thesis/copy_sim_results.sh

@@ -0,0 +1,170 @@
+#!/bin/bash
+
+BASE_PATH="/home/andreas/workspace/private/ma-sw-results/outputs/"
+
+# Copy BP param exploration results
+
+function post_process_LERs() {
+    local filename="$1"
+
+    python3 -c "
+import pandas as pd
+import numpy as np
+
+df = pd.read_csv('${filename}')
+df['LER_per_round'] = 1 - (1 - df['LER'])**(1/12)
+df['num_errors'] = df['num_trials'] * df['LER']
+df.to_csv('${filename}', index=False)
+"       
+}
+
+i=1
+sp="/-\|"
+
+# echo "Copying BP param exploration results..."
+# echo -n ' '
+# for decoder in "WindowingSyndromeMinSumDecoder" "WindowingSyndromeSpaDecoder"; do
+#     for max_iter in 32 200 5000; do
+#         for pass_soft_info in "True" "False"; do
+#             for F in 1 2 3; do
+#                 for W in 3 4 5; do
+#                     SRC_PATH="${BASE_PATH}+rust_exp=soft_v_hard_bp,decoder.class_name=${decoder},decoder.max_iter=${max_iter},decoder.pass_soft_info=${pass_soft_info},system.F=${F},system.W=${W}/"
+#                     LATEST_RESULTS_DIR=$(ls -t ${SRC_PATH} | head -1)
+#                     SRC_FILE="${SRC_PATH}/${LATEST_RESULTS_DIR}/LERs.csv"
+#                     DEST_DIR="res/sim/WF/${decoder}/max_iter_${max_iter}/pass_soft_info_${pass_soft_info}/F_${F}/W_${W}/"
+#                     mkdir -p ${DEST_DIR}
+#                     DEST_FILE="${DEST_DIR}/LERs.csv"
+#                     cp ${SRC_FILE} ${DEST_FILE}
+#                     post_process_LERs ${DEST_FILE}
+#                     printf "\b${sp:i++%${#sp}:1}"
+#                 done
+#             done
+#         done
+#     done
+# done
+#
+# # Copy BPGD param exploration results
+#
+# echo -e "\rCopying BPGD param exploration results..."
+# echo -n ' '
+# for max_iter in 32 200 5000; do
+#     for pass_soft_info in "True" "False"; do
+#         for F in 1 2 3; do
+#             for W in 3 4 5; do
+#                 SRC_PATH="${BASE_PATH}/+rust_exp=soft_v_hard_bpgd,decoder.class_name=WindowingSyndromeSpaGdDecoder,decoder.max_iter=${max_iter},decoder.pass_soft_info=${pass_soft_info},system.F=${F},system.W=${W}/"
+#                 LATEST_RESULTS_DIR=$(ls -t ${SRC_PATH} | head -1)
+#                 SRC_FILE="${SRC_PATH}/${LATEST_RESULTS_DIR}/LERs.csv"
+#                 DEST_DIR="res/sim/WF/WindowingSyndromeSpaGdDecoder/max_iter_${max_iter}/pass_soft_info_${pass_soft_info}/F_${F}/W_${W}/"
+#                 mkdir -p ${DEST_DIR}
+#                 DEST_FILE="${DEST_DIR}/LERs.csv"
+#                 cp ${SRC_FILE} ${DEST_FILE}
+#                 post_process_LERs ${DEST_FILE}
+#                 printf "\b${sp:i++%${#sp}:1}"
+#             done
+#         done
+#     done
+# done
+#
+# # Copy BP over max iter. results
+#
+# echo -e "\rCopying BP over max. iter. results..."
+# echo -n ' '
+# for decoder in "WindowingSyndromeMinSumDecoder" "WindowingSyndromeSpaDecoder"; do
+#     for p in 0.001 0.0025 0.004; do
+#         for pass_soft_info in "True" "False"; do
+#             for F in 1 2 3; do
+#                 for W in 3 4 5; do
+#                     SRC_PATH="${BASE_PATH}+rust_exp=max_iter_bp,decoder.class_name=${decoder},decoder.pass_soft_info=${pass_soft_info},simulation.phy_err_rate=${p},system.F=${F},system.W=${W}/"
+#                     LATEST_RESULTS_DIR=$(ls -t ${SRC_PATH} | head -1)
+#                     SRC_FILE="${SRC_PATH}/${LATEST_RESULTS_DIR}/LERs.csv"
+#                     DEST_DIR="res/sim/max_iter/${decoder}/p_${p}/pass_soft_info_${pass_soft_info}/F_${F}/W_${W}"
+#                     mkdir -p ${DEST_DIR}
+#                     DEST_FILE="${DEST_DIR}/LERs.csv"
+#                     cp ${SRC_FILE} ${DEST_FILE}
+#                     post_process_LERs ${DEST_FILE}
+#                     printf "\b${sp:i++%${#sp}:1}"
+#                 done
+#             done
+#         done
+#     done
+# done
+#
+# # Copy BPGD over max iter. results
+#
+# echo -e "\rCopying BPGD over max. iter. results..."
+# echo -n ' '
+# for p in 0.001 0.0025 0.004; do
+#     for pass_soft_info in "True" "False"; do
+#         for F in 1 2 3; do
+#             for W in 3 4 5; do
+#                 SRC_PATH="${BASE_PATH}+rust_exp=max_iter_bpgd,decoder.class_name=WindowingSyndromeSpaGdDecoder,decoder.pass_soft_info=${pass_soft_info},simulation.phy_err_rate=${p},system.F=${F},system.W=${W}/"
+#                 LATEST_RESULTS_DIR=$(ls -t ${SRC_PATH} | head -1)
+#                 SRC_FILE="${SRC_PATH}/${LATEST_RESULTS_DIR}/LERs.csv"
+#                 DEST_DIR="res/sim/max_iter/WindowingSyndromeSpaGdDecoder/p_${p}/pass_soft_info_${pass_soft_info}/F_${F}/W_${W}"
+#                 mkdir -p ${DEST_DIR}
+#                 DEST_FILE="${DEST_DIR}/LERs.csv"
+#                 cp ${SRC_FILE} ${DEST_FILE}
+#                 post_process_LERs ${DEST_FILE}
+#                 printf "\b${sp:i++%${#sp}:1}"
+#             done
+#         done
+#     done
+# done
+#
+# # Copy BP over max iter. results
+#
+# echo -e "\rCopying one-shot simulation results..."
+# echo -n ' '
+# for decoder in "SyndromeMinSumDecoder" "SyndromeSpaDecoder" "SyndromeSpaGdDecoder"; do
+#     for max_iter in 32 200 5000; do
+#         SRC_PATH="${BASE_PATH}+rust_exp=whole_bp_bpgd,decoder.class_name=${decoder},decoder.max_iter=${max_iter},system.F=1,system.W=5/"
+#         LATEST_RESULTS_DIR=$(ls -t ${SRC_PATH} | head -1)
+#         SRC_FILE="${SRC_PATH}/${LATEST_RESULTS_DIR}/LERs.csv"
+#         DEST_DIR="res/sim/one-shot/${decoder}/max_iter_${max_iter}/"
+#         mkdir -p ${DEST_DIR}
+#         DEST_FILE="${DEST_DIR}/LERs.csv"
+#         cp ${SRC_FILE} ${DEST_FILE}
+#         post_process_LERs ${DEST_FILE}
+#         printf "\b${sp:i++%${#sp}:1}"
+#     done
+# done
+
+# # Copy BPGD decimation passing
+#
+# echo -e "\rCopying BPGD param exploration results..."
+# echo -n ' '
+# for max_iter in 32 200 5000; do
+#     for F in 1 2 3; do
+#         for W in 3 4 5; do
+#             SRC_PATH="${BASE_PATH}+rust_exp=soft_v_hard_bpgd_pass_channel,decoder.class_name=WindowingSyndromeSpaGdDecoder,decoder.max_iter=${max_iter},decoder.pass_soft_info=True,system.F=${F},system.W=${W}"
+#             LATEST_RESULTS_DIR=$(ls -t ${SRC_PATH} | head -1)
+#             SRC_FILE="${SRC_PATH}/${LATEST_RESULTS_DIR}/LERs.csv"
+#             DEST_DIR="res/sim/WF/WindowingSyndromeSpaGdDecoderPassDecimation/max_iter_${max_iter}/pass_soft_info_True/F_${F}/W_${W}/"
+#             mkdir -p ${DEST_DIR}
+#             DEST_FILE="${DEST_DIR}/LERs.csv"
+#             cp ${SRC_FILE} ${DEST_FILE}
+#             post_process_LERs ${DEST_FILE}
+#             printf "\b${sp:i++%${#sp}:1}"
+#         done
+#     done
+# done
+
+# Copy BPGD with decimation info passing over max iter. results
+
+echo -e "\rCopying BPGD over max. iter. results..."
+echo -n ' '
+for pass_soft_info in "True" "False"; do
+    for F in 1 2 3; do
+        for W in 3 4 5; do
+            SRC_PATH="${BASE_PATH}+rust_exp=max_iter_bpgd_pass_channel,decoder.class_name=WindowingSyndromeSpaGdDecoder,decoder.pass_soft_info=${pass_soft_info},simulation.phy_err_rate=0.0025,system.F=${F},system.W=${W}/"
+            LATEST_RESULTS_DIR=$(ls -t ${SRC_PATH} | head -1)
+            SRC_FILE="${SRC_PATH}/${LATEST_RESULTS_DIR}/LERs.csv"
+            DEST_DIR="res/sim/max_iter/WindowingSyndromeSpaGdDecoderPassDecimation/p_0.0025/pass_soft_info_${pass_soft_info}/F_${F}/W_${W}"
+            mkdir -p ${DEST_DIR}
+            DEST_FILE="${DEST_DIR}/LERs.csv"
+            cp ${SRC_FILE} ${DEST_FILE}
+            post_process_LERs ${DEST_FILE}
+            printf "\b${sp:i++%${#sp}:1}"
+        done
+    done
+done

src/thesis/main.tex

@@ -6,27 +6,37 @@
 \usepackage{amsfonts}
 \usepackage{mleftright}
 \usepackage{bm}
+\usepackage{bbm}
 \usepackage{tikz}
 \usepackage{xcolor}
 \usepackage{pgfplots}
 \pgfplotsset{compat=newest}
 \usepackage{acro}
 \usepackage{braket}
+\usepackage{listings}
+\usepackage{caption}
 % \usepackage[
 %     backend=biber,
 %     style=ieee,
 %     sorting=nty,
 % ]{biblatex}
-\usepackage{todonotes}
+% \usepackage{todonotes}
+\usepackage{quantikz}
+\usepackage{stmaryrd}
+\usepackage{algorithm}
+\usepackage[noEnd=false]{algpseudocodex}
+\usepackage{nicematrix}
+\usepackage{colortbl}
 
 \usetikzlibrary{calc, positioning, arrows, fit}
-
 \usetikzlibrary{external}
 \tikzexternalize
 
-\makeatletter
-\renewcommand{\todo}[2][]{\tikzexternaldisable\@todo[#1]{#2}\tikzexternalenable}
-\makeatother
+% \makeatletter
+% \renewcommand{\todo}[2][]{\tikzexternaldisable\@todo[#1]{#2}\tikzexternalenable}
+% \makeatother
+
+\setcounter{MaxMatrixCols}{20}
 
 %
 %
@@ -35,6 +45,8 @@
 %
 
 \newcommand{\red}[1]{\textcolor{red}{#1}}
+\newcommand{\content}[1]{\noindent\indent\red{[#1]}\\}
+
 \newcommand{\figwidth}{10cm}
 \newcommand{\figheight}{7.5cm}
 

src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_False/F_1/W_3/LERs.csv

@@ -0,0 +1,8 @@
+physical_p,num_trials,LER,LER_per_round,num_errors
+0.001,12000,0.01675,0.0014066653566989773,201.0
+0.0015,6000,0.048,0.004090796817048492,288.0
+0.002,2000,0.124,0.010971798240880681,248.0
+0.0025,2000,0.258,0.024560528611376475,516.0
+0.003,2000,0.441,0.04731136584915907,882.0
+0.0035,2000,0.6485,0.08344096230884013,1297.0
+0.004,2000,0.8085,0.1286738833656923,1617.0

src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_False/F_1/W_4/LERs.csv

@@ -0,0 +1,8 @@
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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_False/F_1/W_5/LERs.csv

@@ -0,0 +1,8 @@
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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_False/F_2/W_3/LERs.csv

@@ -0,0 +1,8 @@
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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_False/F_2/W_4/LERs.csv

@@ -0,0 +1,8 @@
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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_False/F_2/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_False/F_3/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_False/F_3/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_False/F_3/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_True/F_1/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_True/F_1/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_True/F_1/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_True/F_2/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_True/F_2/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_True/F_2/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_True/F_3/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_True/F_3/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_200/pass_soft_info_True/F_3/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_False/F_1/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_False/F_1/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_False/F_1/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_False/F_2/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_False/F_2/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_False/F_2/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_False/F_3/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_False/F_3/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_False/F_3/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_True/F_1/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_True/F_1/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_True/F_1/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_True/F_2/W_3/LERs.csv

@@ -0,0 +1,8 @@
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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_True/F_2/W_4/LERs.csv

@@ -0,0 +1,8 @@
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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_True/F_2/W_5/LERs.csv

@@ -0,0 +1,8 @@
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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_True/F_3/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_True/F_3/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_32/pass_soft_info_True/F_3/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_False/F_1/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_False/F_1/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_False/F_1/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_False/F_2/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_False/F_2/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_False/F_2/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_False/F_3/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_False/F_3/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_False/F_3/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_True/F_1/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_True/F_1/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_True/F_1/W_5/LERs.csv

@@ -0,0 +1,8 @@
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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_True/F_2/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_True/F_2/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_True/F_2/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_True/F_3/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_True/F_3/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeMinSumDecoder/max_iter_5000/pass_soft_info_True/F_3/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_False/F_1/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_False/F_1/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_False/F_1/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_False/F_2/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_False/F_2/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_False/F_2/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_False/F_3/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_False/F_3/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_False/F_3/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_True/F_1/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_True/F_1/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_True/F_1/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_True/F_2/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_True/F_2/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_True/F_2/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_True/F_3/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_True/F_3/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_200/pass_soft_info_True/F_3/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_False/F_1/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_False/F_1/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_False/F_1/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_False/F_2/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_False/F_2/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_False/F_2/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_False/F_3/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_False/F_3/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_False/F_3/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_True/F_1/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_True/F_1/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_True/F_1/W_5/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_True/F_2/W_3/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_True/F_2/W_4/LERs.csv

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src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_True/F_3/W_3/LERs.csv

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+0.0035,2000,0.997,0.3837454986270925,1994.0
+0.004,2000,0.9995,0.4692204681934514,1999.0

src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_True/F_3/W_4/LERs.csv

@@ -0,0 +1,8 @@
+physical_p,num_trials,LER,LER_per_round,num_errors
+0.001,2000,0.138,0.012298745249961884,276.0
+0.0015,2000,0.2515,0.023851292168152738,503.0
+0.002,2000,0.4005,0.04174204711940421,801.0
+0.0025,2000,0.5515,0.06463696262955332,1103.0
+0.003,2000,0.7215,0.10105021415209858,1443.0
+0.0035,2000,0.854,0.14815076449150033,1708.0
+0.004,2000,0.9375,0.2062994740159002,1875.0

src/thesis/res/sim/WF/WindowingSyndromeSpaDecoder/max_iter_32/pass_soft_info_True/F_3/W_5/LERs.csv

@@ -0,0 +1,8 @@
+physical_p,num_trials,LER,LER_per_round,num_errors
+0.001,4000,0.061,0.005231252406122322,244.0
+0.0015,2000,0.129,0.011443461592906767,258.0
+0.002,2000,0.2375,0.022342685193895928,475.0
+0.0025,2000,0.39,0.040354525526934304,780.0
+0.003,2000,0.5625,0.06657053735419127,1125.0
+0.0035,2000,0.72,0.10064772839754166,1440.0
+0.004,2000,0.8455,0.14412427850801302,1691.0