Quantum Correlations are Tightly Bound by the Exclusivity Principle

TL;DR

This paper demonstrates that the exclusivity principle imposes a tight constraint on quantum correlations, potentially serving as a fundamental principle that uniquely characterizes quantum correlations across various scenarios.

Contribution

It provides a tight inequality derived from the exclusivity principle and proves its sufficiency in characterizing quantum correlations for any graph-based scenario.

Findings

The exclusivity principle imposes a stronger restriction than previously known.

The derived inequality is tight and singles out quantum correlations.

The principle applies universally to scenarios represented by any graph.

Abstract

It is a fundamental problem in physics of what principle limits the correlations as predicted by our current description of nature, based on quantum mechanics. One possible explanation is the "global exclusivity" principle recently discussed in Phys. Rev. Lett. 110, 060402 (2013). In this work we show that this principle actually has a much stronger restriction on the probability distribution. We provide a tight constraint inequality imposed by this principle and prove that this principle singles out quantum correlations in scenarios represented by any graph. Our result implies that the exclusivity principle might be one of the fundamental principles of nature.