Proposal for revealing quantum nonlocality via local contextuality

TL;DR

This paper proposes a method to reveal quantum nonlocality through local contextuality, highlighting the fundamental role of contextuality in nonlocal correlations and enabling experimental tests of related theorems.

Contribution

It introduces a novel approach connecting local contextuality with quantum nonlocality, facilitating experimental verification of the Kochen-Specker with locality theorem.

Findings

Quantum nonlocality can be demonstrated via local contextuality.

Extra correlations in successive measurements reveal nonlocality.

The approach enables experimental testing of foundational quantum theorems.

Abstract

Two distant systems can exhibit quantum nonlocality even though the correlations between them admit a local model. This nonlocality can be revealed by testing extra correlations between successive measurements on one of the systems which do not admit a noncontextual model whatever the reduced state of this system is. This shows that quantum contextuality plays a fundamental role in quantum nonlocality, and allows an experimental test of the Kochen-Specker with locality theorem.