From 474b1d21da68a8939ce6ed57569938402973fb57 Mon Sep 17 00:00:00 2001
From: Andreas Tsouchlos <an.tsouchlos@gmail.com>
Date: Sat, 25 Apr 2026 16:00:19 +0200
Subject: [PATCH] Add Tanner graph windowing figure

---
 src/thesis/chapters/3_fault_tolerant_qec.tex | 117 ++++++++++++++++++-
 1 file changed, 111 insertions(+), 6 deletions(-)

diff --git a/src/thesis/chapters/3_fault_tolerant_qec.tex b/src/thesis/chapters/3_fault_tolerant_qec.tex
index 5333e75..04c8669 100644
--- a/src/thesis/chapters/3_fault_tolerant_qec.tex
+++ b/src/thesis/chapters/3_fault_tolerant_qec.tex
@@ -409,17 +409,122 @@
     \begin{tikzpicture}
         \draw[{Latex}-{Latex}, line width=.7pt] (0,   -0.75mm) -- (0,  5mm);
         \draw[line width=1pt]                   (-1mm,-0.75mm) -- (3mm,-0.75mm);
-        \draw[line width=1pt]                   (-1mm,5mm) -- (3mm,5mm);
+        \draw[line width=1pt]                   (-1mm,5mm)     -- (3mm,5mm);
         \node[left] at                          (-2mm,2.125mm) {$\sim W$};
-                                                         1
+
         \draw[{Latex}-{Latex}, line width=.3pt] (6.5cm,1.6mm)  -- (6.5cm,5mm);
-        \draw[line width=1pt]                  (6.5cm,4.9mm) -- (6.5cm,7mm);
-        \node[above] at                        (6.5cm,7mm) {$\sim F$};
+        \draw[line width=1pt]                   (6.5cm,4.9mm)  -- (6.5cm,7mm);
+        \node[above] at                         (6.5cm,7mm) {$\sim F$};
     \end{tikzpicture}
 
     \vspace*{10mm}
 
-    \caption{Visualization of the windowing process.}
-    \label{fig:Visualization of the windowing process}
+    \caption{
+        Visualization of the windowing process on the detector
+        error matrix.
+    }
+    \label{fig:windowing_pcm}
+\end{figure}
+
+\begin{figure}[t]
+    \centering
+
+    \tikzset{
+        VN/.style={
+            circle, fill=KITgreen, minimum width=1mm, minimum height=1mm,
+        },
+        CN/.style={
+            rectangle, fill=KITblue, minimum width=1mm, minimum height=1mm,
+        },
+    }
+
+    \begin{tikzpicture}[node distance = 5mm]
+        \node[VN]                  (vn00) {};
+        \node[VN, below = of vn00] (vn01) {};
+        \node[VN, below = of vn01] (vn02) {};
+        \node[VN, below = of vn02] (vn03) {};
+        \node[VN, below = of vn03] (vn04) {};
+
+        \coordinate (temp) at ($(vn01)!0.5!(vn02)$);
+
+        \node[CN, left =10mm of temp] (cn00) {};
+        \node[CN, below = of cn00] (cn01) {};
+
+        \draw (vn00) -- (cn00);
+        \draw (vn01) -- (cn00);
+        \draw (vn03) -- (cn00);
+        \draw (vn01) -- (cn01);
+        \draw (vn02) -- (cn01);
+        \draw (vn04) -- (cn01);
+
+        \foreach \i in {1,2,3,4} {
+            \pgfmathtruncatemacro{\prev}{\i-1}
+
+            \node[VN, right = 25mm of vn\prev 0] (vn\i0) {};
+            \node[VN, below = of vn\i0]          (vn\i1) {};
+            \node[VN, below = of vn\i1]          (vn\i2) {};
+            \node[VN, below = of vn\i2]          (vn\i3) {};
+            \node[VN, below = of vn\i3]          (vn\i4) {};
+
+            \coordinate (temp) at ($(vn\i1)!0.5!(vn\i2)$);
+
+            \node[CN, left = 10mm of temp] (cn\i0) {};
+            \node[CN, below = of cn\i0]     (cn\i1) {};
+
+            \draw (vn\i0) -- (cn\i0);
+            \draw (vn\i1) -- (cn\i0);
+            \draw (vn\i3) -- (cn\i0);
+            \draw (vn\i1) -- (cn\i1);
+            \draw (vn\i2) -- (cn\i1);
+            \draw (vn\i4) -- (cn\i1);
+        }
+
+        \foreach \i in {1,2,3,4} {
+            \pgfmathtruncatemacro{\prev}{\i-1}
+
+            \draw (vn\prev 3) -- (cn\i 0);
+            \draw (vn\prev 4) -- (cn\i 1);
+        }
+
+        \node[
+            draw, inner sep=5mm,line width=1pt,
+            fit=(vn00)(vn04)(cn00)(cn01)(vn20)(vn24)(cn20)(cn21)
+        ]
+        (box1) {};
+        \node[
+            draw, dashed, inner sep=5mm, inner ysep=8mm,line width=1pt,
+            fit=(vn10)(vn14)(cn10)(cn11)(vn30)(vn34)(cn30)(cn31)
+        ]
+        (box2) {};
+
+        % Marker for W on the bottom
+        \draw[line width=1pt]
+        ([yshift=-5mm, line width=1pt]box1.south west) -- ++(0,-4mm)
+        coordinate (dim1l);
+        \draw[line width=1pt]
+        ([yshift=-5mm]box1.south east) -- ++(0,-4mm)
+        coordinate (dim1r);
+        \draw[{Latex}-{Latex}, line width=1pt]
+        ([yshift=1mm]dim1l) -- ([yshift=1mm]dim1r)
+        node[midway, below=2pt] {$W$};
+
+        % Marker for F on top
+        \draw[line width=1pt]
+        ([yshift=3mm]box2.north west) -- ++(0,4mm)
+        coordinate (dim3l);
+        \draw[line width=1pt]
+        ([yshift=3mm]box2.north west -| box1.north west) -- ++(0,4mm)
+        coordinate (dim3r);
+        \draw[{Latex}-{Latex}, line width=1pt]
+        ([yshift=-1mm]dim3l) -- ([yshift=-1mm]dim3r)
+        node[midway, above=2pt] {$F$};
+
+        % Arrow on the top right
+        \draw[-{Latex}, line width=1pt]
+        ([yshift=8mm] box1.north east) -- ++(28mm,0);
+    \end{tikzpicture}
+
+    \caption{Visualization of the windowing process on the Tanner graph.}
+    \label{fig:windowing_tanner}
 \end{figure}