Experimental violation of Svetlichny's inequality

TL;DR

This paper reports an experimental test of Svetlichny's inequality using three-photon GHZ states, demonstrating a significant violation that challenges certain nonlocal realistic theories.

Contribution

First experimental violation of Svetlichny's inequality with high-fidelity three-photon GHZ states, ruling out a class of restricted nonlocal realistic models.

Findings

Observed a 3.6 standard deviation violation of Svetlichny's inequality.

Generated and characterized three-photon GHZ states with 84% fidelity.

Provided experimental evidence against certain nonlocal realistic theories.

Abstract

It is well known that quantum mechanics is incompatible with local realistic theories. Svetlichny showed, through the development of a Bell-like inequality, that quantum mechanics is also incompatible with a restricted class of nonlocal realistic theories for three particles where any two-body nonlocal correlations are allowed [Phys. Rev. D 35, 3066 (1987)]. In the present work, we experimentally generate three-photon GHZ states to test Svetlichny's inequality. Our states are fully characterized by quantum state tomography using an overcomplete set of measurements and have a fidelity of (84+/-1)% with the target state. We measure a convincing, 3.6 std., violation of Svetlichny's inequality and rule out this class of restricted nonlocal realistic models.