Revealing Hidden Genuine Tripartite Nonlocality

TL;DR

This paper introduces a new method to reveal genuine tripartite nonlocality in quantum states that are not initially nonlocal, showing that nonlocality can be activated through measurement sequences and SLOCC.

Contribution

It demonstrates that certain tripartite quantum states can exhibit genuine 3-way nonlocality after SLOCC, even if they do not initially show this property in a specific Bell scenario.

Findings

Genuine 3-way nonlocality can be activated via SLOCC.

Some tripartite states are not initially genuinely nonlocal.

Measurement sequences can reveal hidden nonlocality.

Abstract

Nonlocal correlations arising from measurements on tripartite entangled states can be classified into two groups, one genuinely $3-$way nonlocal and other local with respect to some bipartition. Still, whether a genuinely tripartite entangled quantum state can exhibit genuine $3-$way nonlocality, remains a challenging problem so far as measurement context is concerned. Here we introduce a novel approach in this regard. We consider three tripartite quantum states none of which is genuinely $3-$way nonlocal in a specific Bell scenario (three parties, two measurements per party, two outcomes per measurement), but they can exhibit genuine $3-$way nonlocality when the initial states are subjected to stochastic local operations and classical communication (SLOCC). So, genuine $3-$way nonlocality is a resource, which can be revealed by using a sequence of measurements.