The violation of Bell inequality in frustrated interference

This dataset supports the study of multi-photon frustrated interference in a nonlinear quantum interferometer, demonstrating violations of Bell inequalities using unentangled photons. It includes raw photon coincidence counts recorded by a time-correlated single-photon counting (TCSPC) system, as well as detailed experimental parameters. The data provides a resource for further analysis of nonclassical interference effects and for validating theoretical models in quantum foundations. Methods The dataset was collected in a nonlinear quantum interferometer. Photon arrival times were recorded with a time-correlated single-photon counting (TCSPC) system. Coincidence counts were obtained by comparing the arrival times of photons. During the experiment, the interferometer’s internal phases were precisely controlled to explore different interference conditions. The coincidence counts were measured for various phase settings in the interferometer. The raw coincidence counts were analyzed to calculate correlations between the photon detection events. These correlations were then used to evaluate the CHSH inequality under different phase configurations. The dataset provides the raw counts alongside the experimental parameters required for further analysis.