Revealing hidden standard tripartite nonlocality by local filtering

TL;DR

This paper demonstrates how local filtering operations can reveal hidden standard tripartite nonlocality in quantum states, enhancing the detection of nonlocal correlations beyond traditional methods.

Contribution

It provides a tight upper bound on the Mermin operator's expectation value and shows how local filtering uncovers hidden nonlocality in noisy entangled states.

Findings

Local filtering reveals hidden tripartite nonlocality.

Enhanced robustness of nonlocality detection in noisy states.

Tight upper bound on Mermin operator expectation value.

Abstract

Quantum nonlocality is a kind of significant quantum correlation that is stronger than quantum entanglement and EPR steering. The standard tripartite nonlocality can be detected by the violation of the Mermin inequality. By using local filtering operations, we give a tight upper bound on the maximal expected value of the Mermin operators. By detailed examples we show that the hidden standard nonlocality can be revealed by local filtering which can enhance the robustness of the noised entangled states.