aqora

An experimental test of non-local realism

Simon Gröblacher, Tomasz Paterek, Rainer Kaltenbaek +4 more

arXiv:0704.2529NatureApr 18, 2007419 citations

Experimental local realism tests without fair sampling assumption

BRIDA, GIORGIO, Marco Genovese, Fabrizio Piacentini

Following the theoretical suggestion of [E. Santos, Phys. Lett. A 327, 33 (2004); E. Santos, Eur. Phys. J. D 42, 501 (2007)], we present experimental results addressed to test restricted families of local realistic models, but without relying on the fair sampling assumption.

Jan 1, 20074 citations

Fair-sampling assumption is not necessary for testing local realism

Dominic William Berry, Hyunseok Jeong, Magdalena Stobińska +1 more

Almost all Bell inequality experiments to date have used postselection and therefore relied on the fair sampling assumption for their interpretation. The standard form of the fair sampling assumption is that the loss is independent of the measurement settings, so the ensemble of detected systems provides a fair statistical sample of the total ensemble. This is often assumed to be needed to interpret Bell inequality experiments as ruling out hidden-variable theories. Here we show that it is not necessary; the loss can depend on measurement settings, provided the detection efficiency factorizes as a function of the measurement settings and any hidden variable. This condition implies that Tsirelson's bound must be satisfied for entangled states. On the other hand, we show that it is possible for Tsirelson's bound to be violated while the Clauser-Horne-Shimony-Holt (CHSH)-Bell inequality still holds for unentangled states, and present an experimentally feasible example.Almost all Bell inequality experiments to date have used postselection and therefore relied on the fair sampling assumption for their interpretation. The standard form of the fair sampling assumption is that the loss is independent of the measurement settings, so the ensemble of detected systems provides a fair statistical sample of the total ensemble. This is often assumed to be needed to interpret Bell inequality experiments as ruling out hidden-variable theories. Here we show that it is not necessary; the loss can depend on measurement settings, provided the detection efficiency factorizes as a function of the measurement settings and any hidden variable. This condition implies that Tsirelson's bound must be satisfied for entangled states. On the other hand, we show that it is possible for Tsirelson's bound to be violated while the Clauser-Horne-Shimony-Holt (CHSH)-Bell inequality still holds for unentangled states, and present an experimentally feasible example.

arXiv:0712.2490Physical Review AJan 13, 201033 citations

A Strong Loophole-Free Test of Local Realism

Peter Bierhorst, Lynden K. Shalm, Martin J. Stevens +11 more

Bulletin of the American Physical SocietyMar 16, 20160 citations

Analysis of Assumptions in BIG Bell Test Experiments

Stanisław Sołtan, Dawid Dopierała, Adam Bednorz

Abstract Recently, a group of experiments tested local realism with random choices prepared by humans. These various tests were subject to additional assumptions, which lead to loopholes in the interpretations of almost all of the experiments. Among these assumptions are fair sampling, no signaling, and faithful reproduction of a Bell‐type quantum model. The data from 9 of 13 experiments were examined and occurring anomalies were analyzed in view of the above assumptions. It is concluded that further tests of local realism need better setup calibration to avoid apparent signaling or necessity of the complicated underlying quantum model.Abstract Recently, a group of experiments tested local realism with random choices prepared by humans. These various tests were subject to additional assumptions, which lead to loopholes in the interpretations of almost all of the experiments. Among these assumptions are fair sampling, no signaling, and faithful reproduction of a Bell‐type quantum model. The data from 9 of 13 experiments were examined and occurring anomalies were analyzed in view of the above assumptions. It is concluded that further tests of local realism need better setup calibration to avoid apparent signaling or necessity of the complicated underlying quantum model.

arXiv:1906.05503Annalen der PhysikSep 6, 20202 citations

A Loophole-Free Test of Local Realism

Lynden K. Shalm

Bulletin of the American Physical SocietyOct 22, 20160 citations

Experimental local realism tests without fair sampling assumption

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