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New Slant on the EPR-Bell Experiment

Evans, Peter and Price, Huw and Wharton, Ken (2010) New Slant on the EPR-Bell Experiment. [Preprint]

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Abstract

The best case for thinking that quantum mechanics is nonlocal rests on Bell’s Theorem, and later results of the same kind. However, the correlations characteristic of EPR-Bell (EPRB) experiments also arise in familiar cases elsewhere in QM, where the two measurements involved are timelike rather than spacelike separated; and in which the correlations are usually assumed to have a local causal explanation, requiring no action-at-a-distance. It is interesting to ask how this is possible, in the light of Bell’s Theorem. We investigate this question, and present two options. Either (i) the new cases are nonlocal, too, in which case action-at-a-distance is more widespread in QM than has previously been appreciated (and does not depend on entanglement, as usually construed); or (ii) the means of avoiding action-at-a-distance in the new cases extends in a natural way to EPRB, removing action-at-a-distance in these cases, too. There is a third option, viz., that the new cases are strongly disanalogous to EPRB. But this option requires an argument, so far missing, that the physical world breaks the symmetries which otherwise support the analogy. In the absence of such an argument, the orthodox combination of views – action-at-a-distance in EPRB, but local causality in its timelike analogue – is less well established than it is usually assumed to be.


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Item Type: Preprint
Creators:
CreatorsEmailORCID
Evans, Peter
Price, Huw
Wharton, Ken
Additional Information: Also available here: http://arxiv.org/abs/1001.5057
Keywords: Quantum mechanics, EPR, Bell's inequality, nonlocality, retrocausality
Subjects: Specific Sciences > Physics > Symmetries/Invariances
Specific Sciences > Physics > Quantum Mechanics
Depositing User: Prof Huw Price
Date Deposited: 24 Jun 2010
Last Modified: 07 Oct 2010 15:19
Item ID: 5440
URI: http://philsci-archive.pitt.edu/id/eprint/5440

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