Entanglement and nonlocality are inequivalent for any number of particles

TL;DR

This paper demonstrates that for any number of particles, entanglement and nonlocality are fundamentally different resources, with some entangled states lacking nonlocal correlations, extending known bipartite results to multipartite systems.

Contribution

It provides a general construction of multipartite entangled states that do not exhibit nonlocality, establishing the inequivalence in all multipartite scenarios.

Findings

Existence of genuinely multipartite entangled states without nonlocality

Extension of bipartite inequivalence to multipartite systems

Construction method for such states

Abstract

Understanding the relation between nonlocality and entanglement is one of the fundamental problems in quantum physics. In the bipartite case, it is known that the correlations observed for some entangled quantum states can be explained within the framework of local models, thus proving that these resources are inequivalent in this scenario. However, except for a single example of an entangled three-qubit state that has a local model, almost nothing is known about such relation in multipartite systems. We provide a general construction of genuinely multipartite entangled states that do not display genuinely multipartite nonlocality, thus proving that entanglement and nonlocality are inequivalent for any number of particles.