Experimental violation of local causality in a quantum network

Carvacho, Gonzalo; Andreoli, Francesco; Santodonato, Luca; Bentivegna, Marco; Araújo, Rafael Chaves Souto; Sciarrino, Fábio

Experimental violation of local causality in a quantum network

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dc.contributor.author	Carvacho, Gonzalo
dc.contributor.author	Andreoli, Francesco
dc.contributor.author	Santodonato, Luca
dc.contributor.author	Bentivegna, Marco
dc.contributor.author	Araújo, Rafael Chaves Souto
dc.contributor.author	Sciarrino, Fábio
dc.date.accessioned	2020-09-28T14:50:27Z
dc.date.available	2020-09-28T14:50:27Z
dc.date.issued	2017-03-16
dc.description.resumo	Bell’s theorem plays a crucial role in quantum information processing and thus several experimental investigations of Bell inequalities violations have been carried out over the years. Despite their fundamental relevance, however, previous experiments did not consider an ingredient of relevance for quantum networks: the fact that correlations between distant parties are mediated by several, typically independent sources. Here, using a photonic setup, we investigate a quantum network consisting of three spatially separated nodes whose correlations are mediated by two distinct sources. This scenario allows for the emergence of the so-called non-bilocal correlations, incompatible with any local model involving two independent hidden variables. We experimentally witness the emergence of this kind of quantum correlations by violating a Bell-like inequality under the fair-sampling assumption. Our results provide a proof-of-principle experiment of generalizations of Bell’s theorem for networks, which could represent a potential resource for quantum communication protocols	pt_BR
dc.identifier.citation	CARVACHO, Gonzalo; ANDREOLI, Francesco; SANTODONATO, Luca; BENTIVEGNA, Marco; CHAVES, Rafael; SCIARRINO, Fabio. Experimental violation of local causality in a quantum network. Nature Communications, [S.L.], v. 8, n. 1, p. 14775, 16 mar. 2017. Disponível em: https://www.nature.com/articles/ncomms14775. Acesso em: 17 set. 2020. http://dx.doi.org/10.1038/ncomms14775.	pt_BR
dc.identifier.doi	10.1038/ncomms14775
dc.identifier.issn	2041-1723
dc.identifier.uri	https://repositorio.ufrn.br/handle/123456789/30215
dc.language	en	pt_BR
dc.publisher	Nature Research	pt_BR
dc.rights	Attribution 3.0 Brazil	*
dc.rights.uri	http://creativecommons.org/licenses/by/3.0/br/	*
dc.subject	Quantum networks	pt_BR
dc.subject	Bell’s theorem	pt_BR
dc.title	Experimental violation of local causality in a quantum network	pt_BR
dc.type	article	pt_BR