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We propose a post-processing method for message-passing (MP) decoding of CSSquantum LDPC codes, called stabilizer-inactivation (SI). It relies oninactivating a set of qubits, supporting a check in the dual code, and thenrunning the MP decoding again. This allows MP decoding to converge outside theinactivated set of qubits, while the error on these is determined by solving asmall, constant size, linear system. Compared to the state of the artpost-processing method based on ordered statistics decoding (OSD), we showthrough numerical simulations that MP-SI outperforms MP-OSD for differentquantum LDPC code constructions, different MP decoding algorithms, anddifferent MP scheduling strategies, while having a significantly reducedcomplexity.

Stabilizer Inactivation for Message-Passing Decoding of Quantum LDPC Codes