Work

Single Bell inequality to detect genuine nonlocality in three-qubit pure genuinely entangled states

Year: 2024

Type: article

Abstract: It remains an open question whether every pure multipartite state that is genuinely entangled is also genuinely nonlocal. Recently, a new general construction of Bell inequalities allowing the detection of genuine multipartite nonlocality (GMNL) in quantum states was proposed in Curchod et al (2019 New J. Phys. 21 023016) with the aim of addressing the above problem. Here we show how, in a simple manner, one can improve this construction to deliver finer Bell inequalities for detection of GMNL. Remarkably, we then prove one of the improved Bell inequalities to be powerful enough to detect GMNL in every three-qubit genuinely entangled state. We also generalize some of these inequalities to detect not only GMNL but also nonlocality depth in multipartite states and we present a possible way of generalizing them to the case of more outcomes.

Source: New Journal of Physics

DOI: 10.1088/1367-2630/ad7753

Authors: Ignacy Stachura, Owidiusz Makuta, Remigiusz Augusiak

Institutions: Center for Theoretical Physics, Polish Academy of Sciences

Language: English

Topic: Quantum Mechanics and Applications

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,485

Funder: Narodowe Centrum Nauki