Fig. 4: Nonclassical certification of three-photon quantum walks.
From: Multi-particle quantum walks on 3D integrated photonic chip
a Two-photon bunching curve of the combination (10,11,11). b Simulation and experimental statistical signatures NM of the C-dataset with indistinguishable I (blue) and distinguishable D (red) photons. The graph within the dashed box represents the corresponding added bunching events, which create a separation between the quantum and classical results. c, d Validation results in the (NM, CV, S) space with different η by numerically simulating 5000 different Hamiltonians. η represents the degree of perturbation. (e, f) Validation results in the (NM, CV) plane with different η. According to the SVM classification algorithm, the experimental (square) and simulation (circle) points can fall into one of two clouds representing I (blue) and D (red) photons. The triangle points represent the theoretical values without perturbation, based on the complete correlation matrix
