Elias Amselem, Lars Eirik Danielsen, Antonio J. Lopez-Tarrida, Jose R. Portillo, Mohamed Bourennane, Adan Cabello
Quantum correlations are contextual yet, in general, nothing prevents the existence of even more contextual correlations. We identify and test a noncontextual inequality in which the quantum violation cannot be improved by any hypothetical post-quantum 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.
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http://arxiv.org/abs/1111.3743
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