The EPR paradox, Bell's inequality, and the question of locality

Details The EPR paradox, Bell's inequality, and the question of locality The EPR paradox, Bell's inequality, and the question of locality

2009-02-22

arxiv.org/abs/0902.3827v4

Am. J. Phys. 78 (2010) 111-120

Physics

Quantum Physics

28 pages; change of title, minor wording changes, move to TeX format

Scientific paper

Most physicists agree that the Einstein-Podolsky-Rosen-Bell paradox exemplifies much of the strange behavior of quantum mechanics, but argument persists about what assumptions underlie the paradox. To clarify what the debate is about, we employ a simple and well-known thought experiment involving two correlated photons to help us focus on the logical assumptions needed to construct the EPR and Bell arguments. The view presented in this paper is that the minimal assumptions behind Bell's inequality are locality and counterfactual definiteness, but not scientific realism, determinism, or hidden variables, as is often suggested. We further examine the resulting constraints on physical theory with an illustration from the many-worlds interpretation of quantum mechanics -- an interpretation that we argue is deterministic, local, and realist, but that nonetheless violates the Bell inequality.

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