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Distance-preserving stabilizer measurements in hypergraph product codes

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arxiv 2308.15520 v2 pith:G4ZJ7OOB submitted 2023-08-29 quant-ph

Distance-preserving stabilizer measurements in hypergraph product codes

classification quant-ph
keywords codesdistanceeffectiveqldpcstabilizercircuitfinite-ratehypergraph
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Unlike the surface code, quantum low-density parity-check (QLDPC) codes can have a finite encoding rate, potentially lowering the error correction overhead. However, finite-rate QLDPC codes have nonlocal stabilizers, making it difficult to design stabilizer measurement circuits that are low-depth and do not decrease the effective distance. Here, we demonstrate that a popular family of finite-rate QLDPC codes, hypergraph product codes, has the convenient property of distance-robustness: any stabilizer measurement circuit preserves the effective distance. In particular, we prove the depth-optimal circuit in [Tremblay et al, PRL 129, 050504 (2022)] is also optimal in terms of effective distance.

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