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2016 ; 7
(ä): 13251
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Experimental verification of multipartite entanglement in quantum networks
#MMPMID27827361
McCutcheon W
; Pappa A
; Bell BA
; McMillan A
; Chailloux A
; Lawson T
; Mafu M
; Markham D
; Diamanti E
; Kerenidis I
; Rarity JG
; Tame MS
Nat Commun
2016[Nov]; 7
(ä): 13251
PMID27827361
show ga
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.