Syndrome decoding by quantum approximate optimization [article]

Ching-Yi Lai, Kao-Yueh Kuo, Bo-Jyun Liao
2022 arXiv   pre-print
The syndrome decoding problem is known to be NP-hard. We use the quantum approximate optimization algorithm (QAOA) to solve the syndrome decoding problem with elegantly-designed generator- and check-based cost Hamiltonians for classical and quantum codes. Simulations of the level-4 check-based QAOA decoding of the [7,4,3] Hamming code, as well as the level-4 generator-based QAOA decoding of the [[5,1,3]] quantum code, demonstrate decoding performances that match the maximum likelihood decoding.
more » ... In addition, we show that a combinatorial optimization problem with additional redundant clauses may be more suitable for QAOA, while the number of qubits remains the same. Furthermore, we show that the QAOA decoding of a quantum code is inherently degenerate. That is, degenerate errors of comparable weight will be returned by QAOA with comparable probability. This is supported by simulations of the generator-based QAOA decoding of the [[9,1,3]] Shor code.
arXiv:2207.05942v1 fatcat:pghxq5hoifd6tddj25cdtzygu4