Nonlocality tests enhanced by a third observer

TL;DR

This paper explores how adding a third observer in Bell tests simplifies measurement setups and reveals new nonlocal resources, advancing understanding of quantum nonlocality.

Contribution

It demonstrates that a third observer can reduce measurement complexity and uncover previously unknown nonlocal correlations in bipartite quantum states.

Findings

Third observer simplifies measurement scenarios.

New nonlocal resources identified.

Measurement complexity reduced.

Abstract

We consider Bell tests involving bipartite states shared between three parties. We show that the simple inclusion of a third part may greatly simplify the measurement scenario (in terms of the number of measurement settings per part) and allows the identification of previously unknown nonlocal resources.