A parallel decoder for good quantum LDPC codes

08/10/2022

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by   Anthony Leverrier, et al.

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We introduce a parallel decoding algorithm for recently discovered families of asymptotically good quantum low-density parity-check codes. This algorithm provably corrects arbitrary errors of weight linear in the code length, with a logarithmic number of steps. This decoder applies directly to the family of quantum Tanner codes, and serves as a subroutine for expander lifted product codes. Along the way, we exploit recently established bounds on the robustness of random tensor codes to give a tight bound on the minimum distance of quantum Tanner codes.