From ab6529244622a504f3e591af555839abd31cc545 Mon Sep 17 00:00:00 2001
From: "Victor V. Albert" <valbert4@gmail.com>
Date: Thu, 8 Feb 2024 17:14:08 -0500
Subject: [PATCH] chamon, HH

---
 .../qubits/stabilizer/fracton/chamon.yml      | 29 ++++++++++++++++++
 .../stabilizer/fracton/checkerboard.yml       |  3 +-
 .../qubits/stabilizer/fracton/hh_fracton.yml  | 30 +++++++++++++++++++
 3 files changed, 61 insertions(+), 1 deletion(-)
 create mode 100644 codes/quantum/qubits/stabilizer/fracton/chamon.yml
 create mode 100644 codes/quantum/qubits/stabilizer/fracton/hh_fracton.yml

diff --git a/codes/quantum/qubits/stabilizer/fracton/chamon.yml b/codes/quantum/qubits/stabilizer/fracton/chamon.yml
new file mode 100644
index 000000000..792368ea9
--- /dev/null
+++ b/codes/quantum/qubits/stabilizer/fracton/chamon.yml
@@ -0,0 +1,29 @@
+#######################################################
+## This is a code entry in the error correction zoo. ##
+##       https://github.com/errorcorrectionzoo       ##
+#######################################################
+
+code_id: chamon
+physical: qubits
+logical: qubits
+
+name: 'Chamon model code'
+introduced: '\cite{arXiv:cond-mat/0404182,arXiv:1006.4871}'
+
+description: |
+  A foliated type-I fracton non-CSS code defined on a cubic lattice using one weight-eight stabilizer generator acting on the eight vertices of each cube in the lattice \cite[Eq. (D38)]{arxiv:1908.08049}.
+
+  Variants include a CSS model that is expected to have the same excitation structure \cite{arXiv:1603.04442}.
+
+
+relations:
+  parents:
+    - code_id: qubit_stabilizer
+    - code_id: fracton
+      detail: 'The Chamon model is a foliated type-I fracton code and is the first example of a fracton phase \cite{arxiv:1908.08049}.'
+
+
+_meta:
+  changelog:
+    - user_id: VictorVAlbert
+      date: '2024-02-08'
diff --git a/codes/quantum/qubits/stabilizer/fracton/checkerboard.yml b/codes/quantum/qubits/stabilizer/fracton/checkerboard.yml
index abd701b22..aaec85481 100644
--- a/codes/quantum/qubits/stabilizer/fracton/checkerboard.yml
+++ b/codes/quantum/qubits/stabilizer/fracton/checkerboard.yml
@@ -11,7 +11,8 @@ name: 'Checkerboard model code'
 introduced: '\cite{arXiv:1505.02576}'
 
 description: |
-  A foliated type-I fracton code defined on a cubic lattice that admits weight-eight  \(X\)- and \(Z\)-type stabilizer generators on cubes of the lattice.
+  A foliated type-I fracton code defined on a cubic lattice that admits weight-eight  \(X\)- and \(Z\)-type stabilizer generators on the eight vertices of each cube in the lattice.
+  
   Variants include the twisted checkerboard model \cite{arxiv:1805.06899}.
 
 features:
diff --git a/codes/quantum/qubits/stabilizer/fracton/hh_fracton.yml b/codes/quantum/qubits/stabilizer/fracton/hh_fracton.yml
new file mode 100644
index 000000000..18859bdb5
--- /dev/null
+++ b/codes/quantum/qubits/stabilizer/fracton/hh_fracton.yml
@@ -0,0 +1,30 @@
+#######################################################
+## This is a code entry in the error correction zoo. ##
+##       https://github.com/errorcorrectionzoo       ##
+#######################################################
+
+code_id: hh_fracton
+physical: qubits
+logical: qubits
+
+name: 'Hsieh-Halasz (HH) code'
+short_name: 'HH'
+introduced: '\cite{arXiv:1703.02973}'
+
+description: |
+  Member of one of two families of fracton codes, named HH-I and HH-II, defined on a cubic lattice with two qubits per site.
+  HH-I (HH-II) is a CSS (non-CSS) stabilizer code family, with the former identified as a foliated type-I fracton code \cite{arxiv:1908.08049}.
+
+
+
+relations:
+  parents:
+    - code_id: qubit_stabilizer
+    - code_id: fracton
+      detail: 'Both HH-I and HH-II are fracton codes, with HH-I identified as a foliated type-I fracton code \cite{arxiv:1908.08049}.'
+
+
+_meta:
+  changelog:
+    - user_id: VictorVAlbert
+      date: '2024-02-08'