"Violation of Bell Inequality with Unentangled Photons" (2025) https://arxiv.org/abs/2507.07756 https://arxiv.org/abs/2507.07756 : > By analyzing the measureme

"Violation of Bell Inequality with Unentangled Photons" (2025) https://arxiv.org/abs/2507.07756 https://arxiv.org/abs/2507.07756 : > By analyzing the measurement of four-photon frustrated interference within the standard Bell-test formalism, we find a violation of Bell inequality by more than four standard deviations.