Learned Parallel Bit-Flipping Sequential Belief Propagation Decoding of Quantum LDPC Codes
The proposed decoder improves reliability for Quantum Low-Density Parity-Check (QLDPC) codes over depolarizing channels by combining learned sequential Belief Propagation with a parallel bit-flipping search. It works by running an initial sequential stage, and if the error is not corrected, it tests several promising single-qubit Pauli flips simultaneously in parallel lanes to find the best correction.