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- W3211059672 abstract "Nonlocality inequalities for multi-party systems act as contextuality inequalities for single qudit systems of suitable dimensions (Heywood and Redhead in Found Phys 13(5):481–499, 1983; Abramsky and Brandenburger in New J Phys 13(11):113036, 2011). In this paper, we propose the procedure for adaptation of nonlocality-based quantum conferencing protocols (NQCPs) to contextuality-based QCPs (CQCPs). Unlike the NQCPs, the CQCPs do not involve nonlocal states. As an illustration of the procedure, we present a QCP based on Mermin’s contextuality inequality. As a significant improvement, we propose a QCP based on CHSH contextuality inequality involving only four-dimensional states irrespective of the number of parties sharing the key. The key generation rate of the latter is twice that of the former. Although CQCPs allow for an eavesdropping attack which has no analog in NQCPs, a way out of this attack is demonstrated. Finally, we examine the feasibility of experimental implementation of these protocols with orbital angular momentum states." @default.
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- W3211059672 date "2021-10-01" @default.
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- W3211059672 title "Contextuality-based quantum conferencing" @default.
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- W3211059672 doi "https://doi.org/10.1007/s11128-021-03286-8" @default.
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