Experimental verification of multipartite entanglement in quantum networks.
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Author list: McCutcheon W, Pappa A, Bell BA, McMillan A, Chailloux A, Lawson T, Mafu M, Markham D, Diamanti E, Kerenidis I, Rarity JG, Tame MS
Publisher: Nature Research
Publication year: 2016
Journal: Nature Communications (2041-1723)
Journal acronym: Nat Commun
Volume number: 7
ISSN: 2041-1723
eISSN: 2041-1723
Languages: English-Great Britain (EN-GB)
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.
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