Quantum computer and quantum computing using ising model

摘要

For each pair of a plurality of slave lasers B for which injection synchronization is performed by a master laser M, by controlling the intensity of light exchanged between two slave lasers B and an optical path length between the two slave lasers B using a slave-to-laser intensity control unit IA and an inter-slave laser optical path length control unit IP, the magnitude and the sign of pseudo ising interaction Jij between the two slave lasers B are implemented. After the plurality of slave lasers B arrive at a steady state, by measuring relative values of the oscillation phases of the plurality of slave lasers B with respect to the oscillation phase of the master laser M by using an oscillation phase measuring unit PM, pseudo ising spins σi of the plurality of slave lasers B are measured.

主权项

1. A quantum computer using an ising model comprising:
a plurality of coherent oscillators that oscillate light having polarization polarized in a same direction determined in advance in correspondence with a plurality of sites of the ising model; a master oscillator that performs injection synchronization for the plurality of coherent oscillators and oscillates the light having polarization polarized in the same direction determined in advance; a master oscillator-to-coherent oscillator optical path unit that is arranged between the master oscillator and each one of the coherent oscillators; an inter-coherent oscillator optical path unit that is arranged between two coherent oscillators for each pair of the plurality of the coherent oscillators; an oscillation frequency control unit that is arranged in each master oscillator-to-coherent oscillator optical path unit and controls an oscillation frequency of each one of the coherent oscillators so as to be an oscillation frequency of the master oscillator; an inter-coherent oscillator intensity control unit that is arranged in each inter-coherent oscillator optical path unit for each pair of the plurality of the coherent oscillators and implements a magnitude of pseudo ising interaction between two coherent oscillators by controlling an intensity of light exchanged between the two coherent oscillators; an inter-coherent oscillator optical path length control unit that is arranged in each inter-coherent oscillator optical path unit for each pair of the plurality of the coherent oscillators and implements a sign of the pseudo ising interaction between two coherent oscillators by controlling an optical path length between the two coherent oscillators; and an oscillation phase measuring unit that measures pseudo ising spins of the plurality of the coherent oscillators by measuring relative values of oscillation phases of the plurality of the coherent oscillators with respect to the oscillation phase of the master oscillator after the plurality of the coherent oscillators arrive at a steady state.