2011/11/30 by Elias Amselem, Lars Eirik Danielsen, Antonio J. Lopez-Tarrida +3 · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physrevlett.108.200405
published as Phys. Rev. Lett. 108 (2012) 200405 · REVTeX4, 6 pages, 3 figures
arxiv created 2012/05/18 · arxiv updated 2012/05/21
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.