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American Journal of Physics -- September 2002 -- Volume 70, Issue 9, pp. 903
Entangled photons, nonlocality, and Bell inequalities in the undergraduate laboratory
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Add to FacebookWe 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 variable theory is presented by way of an example and compared to the quantum prediction. A test of the Clauser, Horne, Shimony, and Holt version of the Bell inequality finds S=2.307±0.035, in clear contradiction of hidden variable theories. The experiments described can be performed in an afternoon. © 2002 American Association of Physics Teachers.
© 2002 American Association of Physics Teachers
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Received Dec 2001
Accepted Jun 2002
Online Aug 2002
Accepted Jun 2002
Online Aug 2002
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