Fig. 3: Simulated and measured three-photon correlations.
From: Multi-particle quantum walks on 3D integrated photonic chip
a Experimental and theoretical correlations of indistinguishable and distinguishable photons with all collision-free combinations. The horizontal axes represent all the output combinations from (1,2,3) to (17,18,19). The fidelities F are 93.42% ± 0.15% and 95.70% ± 0.14%. b Experimental correlations of indistinguishable and distinguishable photons in the subspace of the 2-photon bunching events (7 groups: site 5,6,9,10,11,14,15). Each group includes 18 bunching combinations and all the counts are accumulated with 15 h to obtain the normalized probability distributions. Some parts show an increase in quantum correlations compared to classical correlations induced by multi-photon interferences
