An Optical Perfect Matching Solver Based on Frequency Grouping and Multi-Photon Coincidence Counts

An optical perfect matching solver based on frequency grouping and multi-photon coincidence measurement, comprising:

• a broadband biphoton source, a wavelength selector, and a multi-photon coincidence detection system;
• the broadband biphoton source is generated by pumping pulsed laser light into a nonlinear material with broadband phase matching;
• the nonlinear material comprises crystals, on-chip waveguides made of lithium niobate, silicon, or silicon nitride materials;
• the wavelength selector comprises a grating and a spatial light modulator, capable of combining arbitrary frequency components of the input light into a designated output port;
• the multi-photon coincidence detection system consists of single-photon detection channels and a coincidence counting logic circuit board for measuring multi-photon coincidence counts and distributions;
• the broadband biphoton source uses the nonlinear material to generate broadband photon pairs:
• first, the pulsed laser light source is injected into the nonlinear material, where a broadband four-wave mixing effect occurs, generating broadband frequency-correlated photon pairs;
• then, the wavelength selector groups the photons, by grouping the broadband frequency-entangled photon pairs according to different frequencies into several outputs, configured into a specified graph;
• finally, multi-photon coincidence measurements are performed, and the results are directly proportional to the number of perfect matchings.