Experimental violation of local causality in a quantum network - Kölner UniversitätsPublikationsServer

Carvacho, Gonzalo, Andreoli, Francesco ORCID: 0000-0002-1282-0757, Santodonato, Luca, Bentivegna, Marco, Chaves, Rafael ORCID: 0000-0001-8493-4019 and Sciarrino, Fabio (2017). Experimental violation of local causality in a quantum network. Nat. Commun., 8. LONDON: NATURE PUBLISHING GROUP. ISSN 2041-1723

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DOI:10.1038/ncomms14775

Abstract

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.

Item Type:

Journal Article

Creators:

Creators	Email	ORCID	ORCID Put Code
Carvacho, Gonzalo	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Andreoli, Francesco	UNSPECIFIED	orcid.org/0000-0002-1282-0757	UNSPECIFIED
Santodonato, Luca	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Bentivegna, Marco	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED
Chaves, Rafael	UNSPECIFIED	orcid.org/0000-0001-8493-4019	UNSPECIFIED
Sciarrino, Fabio	UNSPECIFIED	UNSPECIFIED	UNSPECIFIED