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Experimental non-locality in a quantum network

Experimental non-locality in a quantum network

Authors :
Carvacho, Gonzalo
Andreoli, Francesco
Santodonato, Luca
Bentivegna, Marco
Chaves, Rafael
Sciarrino, Fabio
Source :
Nature Communications 8, 14775 (2017)
Publication Year :
2016

Abstract

Non-locality stands nowadays not only as one of the cornerstones of quantum theory, but also plays a crucial role in quantum information processing. Several experimental investigations of nonlocality have been carried out over the years. In spite of their fundamental relevance, however, all previous experiments do not consider a crucial ingredient that is ubiquitous in quantum networks: the fact that correlations between distant parties are mediated by several, typically independent, sources of quantum states. Here, using a photonic setup we investigate a quantum network consisting of three spatially separated nodes whose correlations are mediated by two independent sources. This scenario allows for the emergence of a new kind of non-local correlations that we experimentally witness by violating a novel Bell inequality. Our results provide the first experimental proof-of-principle of generalizations of Bell's theorem for networks, a topic that has attracted growing attention and promises a novel route for quantum communication protocols.<br />Comment: 7 pages, 4 figures + 13 pages Supplementary Information

Subjects

Subjects :
Quantum Physics

Details

Database :
arXiv
Journal :
Nature Communications 8, 14775 (2017)
Publication Type :
Report
Accession number :
edsarx.1610.03327
Document Type :
Working Paper
Full Text :
https://doi.org/10.1038/ncomms14775