Data search by a coherent Ising machine based on an injection-locked laser network with gradual pumping or coupling
Kenta Takata, Y. Yamamoto · Physical Review A · 2014
We study two operational schemes for a coherent Ising machine based on an injection-locked laser network. These schemes gradually increase the pumping rate or the mutual coupling among the slave lasers. We numerically simulate the two schemes against a data search problem implemented with the Ising model in cubic graphs without frustration. We show that the machine can achieve a better success probability and effective computational time to find a target ground state with these gradual schemes than those with the abrupt introduction of the mutual injection which has been studied previously. The computational time simulated with typical parameters is almost constant up to the problem size $M=200$ and turns into a nearly linear scale holding up to $M=1000$.