Comment on “A classical model of EPR Experiment with Quantum Mechanical Correlations and Bell Inequalities”

  • Alain Aspect
Part of the NATO ASI Series book series (NSSB, volume 135)


In my talk, I have claimed that the following statement brings the essence of Bell’s theorem : “It is impossible to mimick the quantum mechanical predictions for the EPR correlations, with a reasonable classical-looking model, in the spirit of Einstein’s ideas”. Then Azim Barut disputed this statement. He did so in what would be the most decisive way, that is to say by exhibiting a counter-example, I must say that I would be completely convinced that I am wrong if somebody could make a classical model (i.e. following the laws of classical physics) mimicking all the quantum mechanical predictions for the E.P.R. correlations. But I intend to show here that it is not the case for Barut’s model, for the following reasons:

  1. 1)

    the first version of his model is classical, but doesn’t mimick at all an E.P.R. type experiment;

  2. 2)

    by reinterpretation we can get a model that does mimick the experiment, but this model is no longer “reasonable classical looking” since it involves negative probabilities.



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Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • Alain Aspect
    • 1
  1. 1.Institut d’ Optique Théorique et Appliquée Bâtiment 503Centre Universitaire d’OrsayOrsay CédexFrance

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