  Quantum Monte Carlo (QMC) is commonly used in simulations for Quantum
Annealing (QA), but QMC as a heuristic approach has great difficulty in that it
takes much time to find minimum energy. It mainly depends on the existence of a
trotter layer derived from Suzuki-Trotter decomposition. In this paper, I
propose a new approach to calculate it in short time, although it isn't
rigorous mathematically. Its validity and advantageous points are also
discussed, in comparison with conventional QMC methods.
