Causal hierarchy of multipartite Bell nonlocality

Araújo, Rafael Chaves Souto; Cavalcanti, D.; Aolita, L.

Causal hierarchy of multipartite Bell nonlocality

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dc.contributor.author	Araújo, Rafael Chaves Souto
dc.contributor.author	Cavalcanti, D.
dc.contributor.author	Aolita, L.
dc.date.accessioned	2020-09-28T14:59:16Z
dc.date.available	2020-09-28T14:59:16Z
dc.date.issued	2017-04-08
dc.description.resumo	As with entanglement, different forms of Bell nonlocality arise in the multipartite scenario. These can be defined in terms of relaxations of the causal assumptions in local hidden-variable theories. However, a characterisation of all the forms of multipartite nonlocality has until now been out of reach, mainly due to the complexity of generic multipartite causal models. Here, we employ the formalism of Bayesian networks to reveal connections among different causal structures that make a both practical and physically meaningful classification possible. Our framework holds for arbitrarily many parties. We apply it to study the tripartite scenario in detail, where we fully characterize all the nonlocality classes. Remarkably, we identify new highly nonlocal causal structures that cannot reproduce all quantum correlations. This shows, to our knowledge, the strongest form of quantum multipartite nonlocality known to date. Finally, as a by-product result, we derive a non-trivial Belltype inequality with no quantum violation. Our findings constitute a significant step forward in the understanding of multipartite Bell nonlocality and open several venues for future research	pt_BR
dc.identifier.citation	CHAVES, Rafael; CAVALCANTI, Daniel; AOLITA, Leandro. Causal hierarchy of multipartite Bell nonlocality. Quantum, [S.L.], v. 1, p. 23, 4 ago. 2017. Disponível em: https://quantum-journal.org/papers/q-2017-08-04-23/. Acesso em: 17 set. 2020. http://dx.doi.org/10.22331/q-2017-08-04-23.	pt_BR
dc.identifier.issn	2521-327X
dc.identifier.issn	10.22331/q-2017-08-04-23
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30217
dc.language	en	pt_BR
dc.publisher	Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Bell nonlocalit	pt_BR
dc.subject	Quantum correlations	pt_BR
dc.title	Causal hierarchy of multipartite Bell nonlocality	pt_BR
dc.type	article	pt_BR