Subsystem modular-qudit CSS code 


Modular-qudit subsystem stabilizer code which admits a set of gauge-group generators which consist of either all-\(Z\) or all-\(X\) modular-qudit Pauli strings. This ensures that the code's stabilizer group is also CSS.

The gauge group generators can be expressed as a matrix using the symplectic reprensetation. This matrix is of the form \begin{align} H=\begin{pmatrix}0 & H_{Z}\\ H_{X} & 0 \end{pmatrix}~. \label{eq:parity} \tag*{(1)}\end{align} The two matrix blocks, \(H_{Z}\) and \(H_X\), correspond to the parity-check matrices of two \(q\)-ary linear codes, an \([n,k_X,d_X]_q\) code \(C_X\) and \([n,k_Z,d_Z]_q\) code \(C_Z\), respectively. For prime-dimensional qudits, code parameters and code basis states have been expressed in terms of only data associated with these two classical codes [1,2].


Steane-type decoder utilizing data from the underlying classical codes [2].


  • Subsystem modular-qudit stabilizer code — Subsystem modular-qudit CSS codes are subsystem modular-qudit stabilizer codes whose gauge groups admit a generating set of pure-\(X\) and pure-\(Z\) Pauli strings. Additionally, any \([[n,k,r,d]]_{\mathbb{Z}_q}\) subsystem stabilizer code can be mapped onto a \([[2n,2k,2r,\geq d]]_{\mathbb{Z}_q}\) subsystem CSS code, with the mapping preserving geometric locality of a code up to a constant factor [2]. Every subsystem prime-qudit stabilizer code can be constructed from two nested subsystem prime-qudit CSS codes satisfying certain constraints [2].



  • Modular-qudit CSS code — Subsystem modular-qudit CSS codes reduce to (subspace) modular-qudit CSS codes when there is no gauge subsystem.


S. A. Aly, A. Klappenecker, and P. K. Sarvepalli, “Subsystem Codes”, (2006) arXiv:quant-ph/0610153
M. L. Liu, N. Tantivasadakarn, and V. V. Albert, “Subsystem CSS codes, a tighter stabilizer-to-CSS mapping, and Goursat’s Lemma”, (2023) arXiv:2311.18003
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Zoo Code ID: qudit_subsystem_css

Cite as:
“Subsystem modular-qudit CSS code”, The Error Correction Zoo (V. V. Albert & P. Faist, eds.), 2023.
@incollection{eczoo_qudit_subsystem_css, title={Subsystem modular-qudit CSS code}, booktitle={The Error Correction Zoo}, year={2023}, editor={Albert, Victor V. and Faist, Philippe}, url={} }
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Cite as:

“Subsystem modular-qudit CSS code”, The Error Correction Zoo (V. V. Albert & P. Faist, eds.), 2023.