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Ziran bianzhengfa yanjiu

Grblacher's Experiment and Its Significances

Huang Zheng-xin

Published Jan 1, 2007• 0 citations
OpenAlex

Abstract

A recent experiment by S.Grblacher,A.Zeilinger and colleagues [Nature,446,871-875(2007)] is performed to have tested the new inequality proposed by A.Leggett in 2003 that relies only on realism but relaxes the reliance on locality.They claim that a class of important non-local realism is excluded.This paper summarizes some historical background,major content and consequences of Grblacher's experiment,then,points out that this experiment has important significances for physics and for philosophy.

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A recent experiment by S.Grblacher,A.Zeilinger and colleagues [Nature,446,871-875(2007)] is performed to have tested the new inequality proposed by A.Leggett in 2003 that relies only on realism but relaxes the reliance on locality.They claim that a class of important non-local realism is excluded.This paper summarizes some historical background,major content and consequences of Grblacher's experiment,then,points out that this experiment has important significances for physics and for philosophy.
Recent experiments of Gröblacher et al proved the violation of a Leggett-type inequality that was claimed to be valid for a broad class of non-local hidden-variable theories. The impossibility of constructing a non-local and realistic theory, unless it entails highly counterintuitive features, seems thus to have been experimentally proved. This would bring us close to a definite refutation of realism. Indeed, realism was proved to be also incompatible with locality, according to a series of experiments testing Bell inequalities. The present paper addresses the said experiments of Gröblacher et al and presents an explicit, contextual and realistic, model that reproduces the predictions of quantum mechanics. It thus violates the Leggett-type inequality that was established with the aim of ruling out a supposedly broad class of non-local models. We can thus conclude that plausible contextual, realistic, models are still tenable. This restates the possibility of a future completion of quantum mechanics by a realistic and contextual theory which is not in a class containing only highly counterintuitive models. The class that was ruled out by the experiments of Gröblacher et al is thus proved to be a limited one, arbitrarily separating models that physically belong in the same class.
It is argued that recent experiments refuting nonlocal realism, can also be considered as experiments refuting time-ordered nonlocality and, hence, confirming the result of the before-before experiment. However, the before-before experiment provides a broader refutation because it also falsifies the testable relativistic version of Bohm's nonlocal model. All this stresses the interest of a new before-before experiment demonstrating together the failure of time-ordered nonlocality and the violation of the Leggett's inequality.