Entangled photons, nonlocality, and Bell inequalities in the undergraduate laboratory

  title={Entangled photons, nonlocality, and Bell inequalities in the undergraduate laboratory},
  author={Dietrich A. Dehlinger and Morgan W. Mitchell},
  journal={American Journal of Physics},
We use polarization-entangled photon pairs to demonstrate quantum nonlocality in an experiment suitable for advanced undergraduates. The photons are produced by spontaneous parametric downconversion using a violet diode laser and two nonlinear crystals. The polarization state of the photons is tunable. Using an entangled state analogous to that described in the Einstein–Podolsky–Rosen paradox, we demonstrate strong polarization correlations of the entangled photons. Bell’s idea of a hidden… 

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