From b1a9b1b9b2f04efd6dc39bd2a02c544d34d1259c Mon Sep 17 00:00:00 2001
From: Prefetch
Date: Sun, 1 Jan 2023 16:40:56 +0100
Subject: Change license, add Makefile, add image caching control

---
 source/know/concept/repetition-code/index.md | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

(limited to 'source/know/concept/repetition-code/index.md')

diff --git a/source/know/concept/repetition-code/index.md b/source/know/concept/repetition-code/index.md
index 89e6f4d..fa039a3 100644
--- a/source/know/concept/repetition-code/index.md
+++ b/source/know/concept/repetition-code/index.md
@@ -77,7 +77,8 @@ $$\begin{aligned}
 Such a transformation is easy to achieve with the following sequence
 of [quantum gates](/know/concept/quantum-gate/):
 
-{% include image.html file="bit-flip-encode.png" width="32%" alt="Bit flip code encoder" %}
+{% include image.html file="bit-flip-encode.png" width="32%"
+    alt="Bit flip code encoder" %}
 
 So, a little while after encoding the state $$\Ket{\psi}$$ like that,
 a bit flip occurs on the 2nd qubit:
@@ -180,7 +181,8 @@ without affecting $$\ket{\overline{\psi}}$$ itself,
 by applying $$\mathrm{CNOT}$$s to some ancillary qubits
 and then measuring those:
 
-{% include image.html file="bit-flip-detect.png" width="62%" alt="Bit flip code decoder" %}
+{% include image.html file="bit-flip-detect.png" width="62%"
+    alt="Bit flip code decoder" %}
 
 The two measurements, respectively representing $$ZZI$$ and $$IZZ$$,
 yield $$\Ket{1}$$ if a bit flip definitely occurred,
@@ -231,14 +233,16 @@ $$\begin{aligned}
     = \alpha \Ket{+\!+\!+} + \beta \Ket{-\!-\!-}
 \end{aligned}$$
 
-{% include image.html file="phase-flip-encode.png" width="40%" alt="Phase flip code encoder" %}
+{% include image.html file="phase-flip-encode.png" width="40%"
+    alt="Phase flip code encoder" %}
 
 A phase flip along the $$Z$$-axis
 corresponds to a bit flip along the $$X$$-axis $$\Ket{+} \to \Ket{-}$$.
 In this case, the stabilizers are $$XXI$$ and $$IXX$$,
 and the error detection circuit is as follows:
 
-{% include image.html file="phase-flip-detect.png" width="70%" alt="Phase flip code decoder" %}
+{% include image.html file="phase-flip-detect.png" width="70%"
+    alt="Phase flip code decoder" %}
 
 This system protects us against all single-qubit phase flips,
 but not against bit flips.
@@ -281,7 +285,8 @@ This encoding is achieved by the following quantum circuit,
 which simply consists of the phase flip encoder,
 followed by 3 copies of the bit flip encoder:
 
-{% include image.html file="shor-code-encode.png" width="55%" alt="Shor code encoder" %}
+{% include image.html file="shor-code-encode.png" width="55%"
+    alt="Shor code encoder" %}
 
 We thus use 9 physical qubits to store 1 logical qubit.
 Fortunately, more efficient schemes exist.
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