Four-photon frustrated interference yields CHSH S = 2.275 ± 0.057, violating the Bell inequality by more than four standard deviations without entangled photons.
By assuming the general white noise and hence the resulting Werner state form, we obtain the Bell violation of S = 2.342 ± 0.051 based on S-V relation
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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.