4.8 Article

Simple Explanation of the Quantum Violation of a Fundamental Inequality

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PHYSICAL REVIEW LETTERS
卷 110, 期 6, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.060402

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  1. [FIS2011-29400]

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We show that the maximum quantum violation of the Klyachko-Can-Binicioglu-Shumovsky (KCBS) inequality is exactly the maximum value satisfying the following principle: The sum of probabilities of pairwise exclusive events cannot exceed 1. We call this principle global exclusivity, since its power shows up when it is applied to global events resulting from enlarged scenarios in which the events in the inequality are considered jointly with other events. We identify scenarios in which this principle singles out quantum contextuality, and show that a recent proof excluding nonlocal boxes follows from the maximum violation imposed by this principle to the KCBS inequality. DOI: 10.1103/PhysRevLett.110.060402

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