关键词: 量子LDPC码, 反馈式, 量子纠错码, 非均衡

Abstract:

For quantum LDPC codes widely studied recent years,the decoding strategy based on the feedback sum-product (FSPA) we proposed before is investigated for the case of unbalanced X-Z channel.And the analysis of the corresponding performance of the FSPA is given.The study shows that under the unbalanced X-Z channel model,the feedback strategy could still exploit the syndrome comparison,the error style of the frustrated checks,the channel character analysis to adjust the probabilities distributions of the concerned information bits,thereby significantly improving the decoding ability of the sum-product decoder.Finally,simulation results verified our statements.

Key words: Quantum LDPC codes;feedback;quantum error correction;unbalance