Local hidden-variable theory: Difference between revisions

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{{short description|Interpretation of quantum mechanics}}

{{quantum|cTopic=Interpretations}}

A '''local hidden-variable theory''' inIn the [[Interpretations of quantum mechanics|interpretation of quantum mechanics]], a '''local hidden-variable theory''' is a [[hidden-variable theory]] that hassatisfies the added requirementcondition of being consistent with [[local realism]]. ItThis refers toincludes all types of the theory that attempt to account for the probabilistic features of [[quantum mechanics]] by the mechanism of underlying inaccessible variables, with the additional requirement from local realism that distant events be independent, ruling out ''instantaneous'' (i.e.that is, [[faster-than-light]]) interactions between separate events.

The mathematical implications of a local hidden-variable theory in regard to the phenomenon of [[quantum entanglement]] were explored by physicist [[John Stewart Bell]], who in 1964 [[Bell's theorem|proved]] that broad classes of local hidden-variable theories cannot reproduce the correlations between measurement outcomes that quantum mechanics predicts. The most notable exception is [[superdeterminism]]. Superdeterministic hidden-variable theories can be [[Principle of locality|local]] and yet be compatible with observations.