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Experimental Verification of Multipartite Entanglement in Quantum Networks

McCutcheon, W; Pappa, A; Bell, BA; McMillan, A; Chailloux, A; Lawson, T; Mafu, M; ... Tame, MS; + view all (2016) Experimental Verification of Multipartite Entanglement in Quantum Networks. Nature Communications , 7 , Article 13251. 10.1038/ncomms13251. Green open access

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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.

Type: Article
Title: Experimental Verification of Multipartite Entanglement in Quantum Networks
Open access status: An open access version is available from UCL Discovery
DOI: 10.1038/ncomms13251
Publisher version: http://dx.doi.org/10.1038/ncomms13251
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Quantum information, Quantum optics, Qubits, Single photons and quantum effects
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1551948
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