Generic tripartite Bell nonlocality sudden death under local phase noise

TL;DR

This paper demonstrates that local phase noise can cause the sudden death of tripartite Bell nonlocality in finite time, even when coherence is only eliminated asymptotically, highlighting a critical fragility of quantum nonlocality.

Contribution

It provides a broad, explicit model showing finite-time Bell nonlocality death under local phase noise in tripartite systems, advancing understanding of quantum decoherence effects.

Findings

Bell nonlocality can vanish suddenly in finite time due to local phase noise.

State coherence may only be eliminated asymptotically, yet nonlocality still dies abruptly.

Tripartite entangled states are particularly susceptible to this nonlocality death.

Abstract

We definitively show, using an explicit and broadly applicable model, that local phase noise that is capable of eliminating state coherence only in the infinite-time limit is capable of eliminating nonlocality in finite time in three two-level systems prepared in the Bell-nonlocal tripartite states of the generic entanglement class.