Four-photon frustrated interference yields CHSH S = 2.275 ± 0.057, violating the Bell inequality by more than four standard deviations without entangled photons.
RESUL TS Experimentally, we measure the quantum correlation between Alice and Bob by fixing α at α1 = 0 , α⊥ 1 = π, α2 = π/2, α⊥ 2 = 3π/2 and sweeping the phase β
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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.