English

Fault-tolerant syndrome extraction in [[n,1,3]] non-CSS code family generated using measurements on graph states

Quantum Physics 2026-05-12 v3 Information Theory math.IT

Abstract

The reliability of quantum computation critically depends on the performance of quantum error-correcting codes (QECCs). Performance of QECCs can be severely degraded by hook errors, which effectively reduce the code distance. In this work, we construct a family of [[n,1,3]][[n,1,3]] non-CSS QECCs, which are fault-tolerant (FT) against noisy syndrome measurements. We employ the bare-ancilla method of Muyuan Li \emph{et al.} to demonstrate fault tolerance against hook errors during syndrome extraction. We present a systematic protocol for generating these QECCs using graph codes and propose a family of [[n,1,3]][[n,1,3]] codes that preserve the fault-tolerant properties of the bare ancilla codes. We use a custom lookup-table decoder and simulate the code's performance under both anisotropic and circuit-level depolarizing noise. Our results reveal a trade-off in performance with respect to the code rate and identify optimized codes under these noise models. We benchmark our results against the flag-qubit method of Chao \emph{et al}. Notably, we report a new bare ancilla code with improved code rate while maintaining the same distance compared to the bare code used in the work of Muyuan Li \emph{et al.}

Keywords

Cite

@article{arxiv.2501.12072,
  title  = {Fault-tolerant syndrome extraction in [[n,1,3]] non-CSS code family generated using measurements on graph states},
  author = {Harsh Gupta and Mainak Bhattacharyya and Ritik Jain and Ankur Raina},
  journal= {arXiv preprint arXiv:2501.12072},
  year   = {2026}
}

Comments

17 pages, 10 figures