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Experimental verification of multipartite entanglement in quantum networks.

TitleExperimental verification of multipartite entanglement in quantum networks.
Publication TypeJournal Article
Year of Publication2016
AuthorsMcCutcheon, W., Pappa A., Bell B. A., McMillan A., Chailloux A., Lawson T., Mafu M., Markham D., Diamanti E., Kerenidis I., Rarity J. G., & Tame M. S.
JournalNat Commun
Volume7
Pagination13251
Date Published2016 11 09
ISSN2041-1723
KeywordsAlgorithms, Automatic Data Processing, Computer-Aided Design, Humans, Models, Theoretical, Photons, Quantum Theory
Abstract

Multipartite entangled states are a fundamental resource for a wide range of quantum information processing tasks. In particular, in quantum networks, it is essential for the parties involved to be able to verify if entanglement is present before they carry out a given distributed task. Here we design and experimentally demonstrate a protocol that allows any party in a network to check if a source is distributing a genuinely multipartite entangled state, even in the presence of untrusted parties. The protocol remains secure against dishonest behaviour of the source and other parties, including the use of system imperfections to their advantage. We demonstrate the verification protocol in a three- and four-party setting using polarization-entangled photons, highlighting its potential for realistic photonic quantum communication and networking applications.

DOI10.1038/ncomms13251
Alternate JournalNat Commun
PubMed ID27827361
PubMed Central IDPMC5105160

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