Efficient Quantum Walk Circuits for Metropolis-Hastings Algorithm
Efficient Quantum Walk Circuits for Metropolis-Hastings Algorithm
复制标题
Metropolis-Hastings 算法的高效量子行走电路
DOI:
10.22331/q-2020-06-29-287
复制
发表时间:
2019
期刊:
影响因子:
6.4
通讯作者:
M. Troyer
中科院分区:
文献类型:
--
作者:
J. Lemieux;B. Heim;D. Poulin;K. Svore;M. Troyer
We present a detailed circuit implementation of Szegedy's quantization of the Metropolis-Hastings walk. This quantum walk is usually defined with respect to an oracle. We find that a direct implementation of this oracle requires costly arithmetic operations. We thus reformulate the quantum walk, circumventing its implementation altogether by closely following the classical Metropolis-Hastings walk. We also present heuristic quantum algorithms that use the quantum walk in the context of discrete optimization problems and numerically study their performances. Our numerical results indicate polynomial quantum speedups in heuristic settings.