Four-photon frustrated interference yields CHSH S = 2.275 ± 0.057, violating the Bell inequality by more than four standard deviations without entangled photons.
Zeilinger, Experiment and the foundations of quantum physics, Rev
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Violation of Bell Inequality with Unentangled Photons
Four-photon frustrated interference yields CHSH S = 2.275 ± 0.057, violating the Bell inequality by more than four standard deviations without entangled photons.