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valbert4 committed Aug 2, 2024
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1 change: 1 addition & 0 deletions codes/quantum/eaqecc.yml
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Expand Up @@ -17,6 +17,7 @@ description: 'QECC whose encoding and decoding utilizes pre-shared entanglement
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Pre-shared entanglement can be prepared in a way that is robust to noise \cite{arxiv:0904.1175}.
notes:
- 'See Ref. \cite{doi:10.1017/CBO9781139034807.009} for an introduction to EAQECCs.'

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2 changes: 1 addition & 1 deletion codes/quantum/properties/block/block_quantum.yml
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Expand Up @@ -23,7 +23,7 @@ protection: |
Errors acting on subsystems in a geometrically local region are called \textit{burst errors} \cite{doi:10.1143/jpsj.69.3540,doi:10.1109/18.771250}.
\subsection{Bounds on code parameters}
Bounds on finite dimensional block code performance include the quantum Singleton bound, quantum Hamming bound, \hyperref[topic:quantum-gv-bound]{quantum GV bound}, various quantum linear programming (LP) bounds \cite{arxiv:quant-ph/9611001,arxiv:quant-ph/9709049} (see the book \cite{preset:GottesmanBook}), and other bounds \cite{doi:10.1109/TIT.2005.862086}.
Bounds on finite dimensional block code performance include the quantum Singleton bound, quantum Hamming bound, \hyperref[topic:quantum-gv-bound]{quantum GV bound}, various quantum linear programming (LP) bounds \cite{arxiv:quant-ph/9611001,arxiv:quant-ph/9709049} (see the book \cite{preset:GottesmanBook}), and other bounds \cite{doi:10.1109/TIT.2005.862086,arxiv:1007.3655}.
A code whose parameters attain the quantum Hamming bound (quantum Singleton bound) is called a perfect quantum code (a quantum MDS code).
\begin{defterm}{Quantum GV bound}
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4 changes: 4 additions & 0 deletions codes/quantum/qubits/ea_qubits_into_qubits.yml
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Expand Up @@ -12,6 +12,10 @@ name: 'EA qubit code'
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Qubit code designed to utilize pre-shared entanglement between sender and receiver.
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The \hyperref[topic:quantum-gv-bound]{quantum GV bound} and Plotkin bound have been extended to EA qubit codes \cite{arxiv:1010.5506}.
features:
rate: 'There are EA versions of classical and quantum capacities \cite{arxiv:quant-ph/9904023}. EA hashing bounds on the minimum entanglement required to achieve the entanglement-assisted channel capacity are derived \cite{arXiv:quant-ph/0205117}.'
encoders:
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2 changes: 2 additions & 0 deletions codes/quantum/qubits/small_distance/small/stab_5_1_3.yml
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Expand Up @@ -30,6 +30,8 @@ description: |
It is the unique code for its parameters, up to local equivalence \cite[Corr. 10]{arxiv:quant-ph/9704043}.
Any 5 qubit \(2T\)-transversal stabilizer code with distance \(d>1\) must be the five-qubit code \cite{arxiv:2306.12526,manual:{Ian Teixeira, private communication, 2024}}.
This code is sometimes referred to as the DiVincenzo-Shor code after a paper that studied the code's syndrome extraction circuits \cite{arxiv:quant-ph/9605031}
protection: 'Smallest stabilizer code that protects against a single error on any one qubit. Detects two-qubit errors.'

features:
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Expand Up @@ -52,7 +52,7 @@ features:
Above values are for one type of noise only, and the ML threshold for combined \(X\) and \(Z\) noise is \(2p_X - p_X^2 \approx 20.6\%\).'
- 'Depolarizing noise: between \(17\%\) and \(18.5\%\) under BSV tensor-network decoding \cite{arxiv:1405.4883}, \(14\%\) under GBP decoding \cite{arxiv:2212.03214}, \(16.5\%\) under recursive MWPM \cite{arxiv:2212.11632}, between \(16\%\) and \(17.5\%\) under AMBP4 (depending on whether surface or toric code is considered) \cite{arxiv:2104.13659}, and between \(15\%\) and \(16\%\) under RG \cite{arxiv:0911.0581}, Markov-chain \cite{arxiv:1302.2669}, or MWPM \cite{arxiv:0905.0531} decoding.
The threshold under ML decoding corresponds to the value of a critical point of the disordered eight-vertex Ising model, calculated to be \(18.9(3)\%\) \cite{arxiv:1202.1852} (see also APS Physics viewpoint \cite{doi:10.1103/Physics.5.50}).'
- 'Erasure noise: \(50\%\) for square tiling \cite{arxiv:,arxiv:0912.1159}.
- 'Erasure noise: \(50\%\) for square tiling \cite{arxiv:0904.3556,arxiv:0912.1159}.
There is an inverse relationship between coordination number of the syndrome graph, with the threshold corresponding to a percolation transition \cite{arxiv:1810.09621}.'
- 'Correlated noise: \(10.04(6)\%\) under mildly correlated bit-flip noise \cite{arxiv:1809.10704}.'
# The latter work considers \(X\)-type noise only, but this is equivalent since \(X\)- and \(Z\)-type noise is corrected independently.
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The construction has been extended to modular qudits \cite{arxiv:2112.02137}.
features:
decoders:
- 'Lindbladian-based dissipative encoding, for which codespace is steady-state space of a Lindbladian \cite{arxiv:1010.2901}.'

features:
transversal_gates:
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