Experimental fully contextual correlations

Quantum correlations are contextual yet, in general, nothing prevents the existence of even more contextual correlations. We identify and test a noncontextuality inequality in which the quantum violation cannot be improved by any hypothetical postquantum theory, and use it to experimentally obtain c...

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Published inPhysical review letters Vol. 108; no. 20; p. 200405
Main Authors Amselem, Elias, Danielsen, Lars Eirik, López-Tarrida, Antonio J, Portillo, José R, Bourennane, Mohamed, Cabello, Adán
Format Journal Article
LanguageEnglish
Published United States 18.05.2012
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Summary:Quantum correlations are contextual yet, in general, nothing prevents the existence of even more contextual correlations. We identify and test a noncontextuality inequality in which the quantum violation cannot be improved by any hypothetical postquantum theory, and use it to experimentally obtain correlations in which the fraction of noncontextual correlations is less than 0.06. Our correlations are experimentally generated from the results of sequential compatible tests on a four-state quantum system encoded in the polarization and path of a single photon.
ISSN:1079-7114
DOI:10.1103/PhysRevLett.108.200405