QUANTUM COMPUTING DEVICE FOR ISING MODEL, QUANTUM PARALLEL COMPUTING DEVICE FOR ISING MODEL, AND QUANTUM COMPUTING METHOD FOR ISING MODEL

摘要

A parametric oscillator oscillates a plurality of pseudo spin pulses SPi having mutually an identical oscillation frequency by using parametric oscillation, an interaction implementing unit performs feedback implementation of a magnitude and a sign of interaction related to each pseudo spin pulse SPi (the proportionality coefficient λi+ΣJijσj+ΣKijkσjσk with respect to σi) by using a tentative measurement result of oscillation phases φi(tentative) of the plurality of pseudo spin pulses SPi, and a pseudo spin measuring unit measures the pseudo spins σi of the plurality of pseudo spin pulses SPi, based on a final measurement result of oscillation phases φi(steady) of the plurality of pseudo spin pulses SPi.

主权项

1. An Ising model quantum computation device comprising:
a parametric oscillator that parametrically oscillates a plurality of pseudo spin pulses, the plurality of pseudo spin pulses being in correspondence with a plurality of Ising model spins in a pseudo manner and having mutually an identical oscillation frequency; a ring resonator in which the plurality of pseudo spin pulses circularly propagate; a tentative spin measuring unit that tentatively measures phases of the plurality of pseudo spin pulses every time the plurality of pseudo spin pulses circularly propagate in the ring resonator to tentatively measure pseudo spins of the plurality of pseudo spin pulses; an interaction computing unit that tentatively computes interaction related to a certain pseudo spin pulse based on a coupling coefficient of the Ising model related to the certain pseudo spin pulse and a pseudo spin of other pseudo spin pulse having been tentatively measured by the tentative spin measuring unit; an interaction implementing unit that controls amplitudes and phases of light injected to the certain pseudo spin pulse to tentatively implement a magnitude and a sign of the interaction related to the certain pseudo spin pulse, the certain pseudo spin pulse having been tentatively computed by the interaction computing unit; and a pseudo spin measuring unit that measures the phases of the plurality of pseudo spin pulses after the plurality of pseudo spin pulses have arrived at a steady state in a process of repeating a feedback loop configured of the tentative spin measuring unit, the interaction computing unit, and the interaction implementing unit to measure the pseudo spins of the plurality of pseudo spin pulses.