Experimental fully contextual correlations
Elias Amselem, Lars Eirik Danielsen, Antonio J. Lopez-Tarrida, Jose R., Portillo, Mohamed Bourennane, Adan Cabello
TL;DR
This paper experimentally demonstrates quantum correlations that are maximally contextual, showing violations of noncontextuality inequalities that cannot be surpassed by any postquantum theories, using a single photon system.
Contribution
It introduces a noncontextuality inequality with quantum violation that is optimal against hypothetical postquantum theories and experimentally tests it with a four-state photon system.
Findings
Quantum violation fraction less than 0.06
Correlations generated from sequential compatible tests
Experimental validation of maximal quantum contextuality
Abstract
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.
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