Experimental Distillation of Quantum Nonlocality

TL;DR

This paper experimentally demonstrates the distillation of quantum nonlocality using entangled photons, confirming a recent theoretical protocol and showing amplification of nonlocal correlations through local operations.

Contribution

First experimental realization of quantum nonlocality distillation confirming theoretical predictions and demonstrating nonlocality amplification with entangled photons.

Findings

Nonlocality can be amplified through local operations.

Experimental validation of a theoretical distillation protocol.

Nonlocal correlations increased after distillation process.

Abstract

We report the first experimental demonstration of distillation of quantum nonlocality, confirming the recent theoretical protocol [\textit{Phys. Rev. Lett. 102, 120401 (2009)}]. Quantum nonlocality is described by a correlation box with binary inputs and outputs, and the nonlocal boxes are realized through appropriate measurements on polarization entangled photon pairs. We demonstrate that nonlocality is amplified by connecting two nonlocal boxes into a composite one through local operations and four-photon coincidence measurements.