Estimation of the CHSH Parameter Using HOM Interference

The Clauser–Horne–Shimony–Holt (CHSH) experiment is an essential test of nonlocality in quantum mechanics and can be used to validate the principle entanglement. In addition verifying entanglement, measurable CHSH parameter also gauge quality entanglement present a system. measurement Hong–Ou–Mandel (HOM) interference another important fundamental optics that measures indistinguishability pair photons. this article, we demonstrate how results HOM experiment, relatively simple obtain estimate for value $S$ parameter, which more complicated measurement. We experimentally technique capable providing within one standard deviation error when spectral impairments are present. expect will aid calibration optical systems.