title: Quantum nonlocality. Detecting nonlocality in many-body quantum states.
abstract: Intensive studies of entanglement properties have proven essential for our understanding of quantum many-body systems. In contrast, much less is known about the role of quantum nonlocality in these systems because the available multipartite Bell inequalities involve correlations among many particles, which are difficult to access experimentally. We constructed multipartite Bell inequalities that involve only two-body correlations and show how they reveal the nonlocality in many-body systems relevant for nuclear and atomic physics. Our inequalities are violated by any number of parties and can be tested by measuring total spin components, opening the way to the experimental detection of many-body nonlocality, for instance with atomic ensembles.
authors.affiliation: ICFO-Institut de Ciències Fotòniques, Avenida Carl Friedrich Gauss, 3, 08860 Castelldefels, Barcelona, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Tura
authors.affiliation: ICFO-Institut de Ciències Fotòniques, Avenida Carl Friedrich Gauss, 3, 08860 Castelldefels, Barcelona, Spain. remigiusz.augusiak@icfo.es.
authors.forename: R
authors.initials: R
authors.lastname: Augusiak
authors.affiliation: ICFO-Institut de Ciències Fotòniques, Avenida Carl Friedrich Gauss, 3, 08860 Castelldefels, Barcelona, Spain.
authors.forename: A B
authors.initials: AB
authors.lastname: Sainz
authors.affiliation: Institute for Nuclear Research, Hungarian Academy of Sciences, H-4001 Debrecen, Post Office Box 51, Hungary.
authors.forename: T
authors.initials: T
authors.lastname: Vértesi
authors.affiliation: ICFO-Institut de Ciències Fotòniques, Avenida Carl Friedrich Gauss, 3, 08860 Castelldefels, Barcelona, Spain. Institució Catalana de Recerca i Estudis Avançats, Lluis Companys 23, 08010 Barcelona, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Lewenstein
authors.affiliation: ICFO-Institut de Ciències Fotòniques, Avenida Carl Friedrich Gauss, 3, 08860 Castelldefels, Barcelona, Spain. Institució Catalana de Recerca i Estudis Avançats, Lluis Companys 23, 08010 Barcelona, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Acín