Fig. 1: Principle and experimental setup of perfect matching solver.
From: Solving perfect matchings by frequency-grouped multi-photon events using a silicon chip
a A path-identity experimental setup with four crystals producing horizontally polarized photon pairs. b The corresponding undirected graph of the setup. All the perfect matchings construct the final quantum state. c Broadband photon pairs produced by optically nonlinear process. d An artistic figure depicts the process that photons are grouped according to frequency and the corresponding graph after the frequency grouping. e Multi-photon coincidence rate with one and only one photon each output is determined by the number of perfect matchings of the graph. f Experimental setup for estimating perfect matchings by frequency grouping of a broadband photon-pair source. FPC fiber polarization controller, DWDM dense wavelength division multiplexing module, PD power detector, WSS wavelength selective switch, SNSPDs superconducting nanowire single photon detectors, CLM coincidence logic module.
