Quantum nonlocality without entanglement depending on nonzero prior probabilities in optimal unambiguous discrimination

Abstract Nonlocality without entanglement(NLWE) is a nonlocal phenomenon that occurs in quantum state discrimination of multipartite separable states. In the discrimination of orthogonal separable states, the term NLWE is used when the quantum states cannot be discriminated perfectly by local operat...

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Autores principales:	Donghoon Ha, Jeong San Kim
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7d59afc6718d492bbbbaf975c1ace30a
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spelling	oai:doaj.org-article:7d59afc6718d492bbbbaf975c1ace30a2021-12-02T14:58:47ZQuantum nonlocality without entanglement depending on nonzero prior probabilities in optimal unambiguous discrimination10.1038/s41598-021-97103-y2045-2322https://doaj.org/article/7d59afc6718d492bbbbaf975c1ace30a2021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-97103-yhttps://doaj.org/toc/2045-2322Abstract Nonlocality without entanglement(NLWE) is a nonlocal phenomenon that occurs in quantum state discrimination of multipartite separable states. In the discrimination of orthogonal separable states, the term NLWE is used when the quantum states cannot be discriminated perfectly by local operations and classical communication. In this case, the occurrence of NLWE is independent of nonzero prior probabilities of quantum states being prepared. Recently, it has been found that the occurrence of NLWE can depend on nonzero prior probabilities in minimum-error discrimination of nonorthogonal separable states. Here, we show that even in optimal unambiguous discrimination, the occurrence of NLWE can depend on nonzero prior probabilities. We further show that NLWE can occur regardless of nonzero prior probabilities, even if only one state can be locally discriminated without error. Our results provide new insights into classifying sets of multipartite quantum states in terms of quantum state discrimination.Donghoon HaJeong San KimNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Donghoon Ha Jeong San Kim Quantum nonlocality without entanglement depending on nonzero prior probabilities in optimal unambiguous discrimination
description	Abstract Nonlocality without entanglement(NLWE) is a nonlocal phenomenon that occurs in quantum state discrimination of multipartite separable states. In the discrimination of orthogonal separable states, the term NLWE is used when the quantum states cannot be discriminated perfectly by local operations and classical communication. In this case, the occurrence of NLWE is independent of nonzero prior probabilities of quantum states being prepared. Recently, it has been found that the occurrence of NLWE can depend on nonzero prior probabilities in minimum-error discrimination of nonorthogonal separable states. Here, we show that even in optimal unambiguous discrimination, the occurrence of NLWE can depend on nonzero prior probabilities. We further show that NLWE can occur regardless of nonzero prior probabilities, even if only one state can be locally discriminated without error. Our results provide new insights into classifying sets of multipartite quantum states in terms of quantum state discrimination.
format	article
author	Donghoon Ha Jeong San Kim
author_facet	Donghoon Ha Jeong San Kim
author_sort	Donghoon Ha
title	Quantum nonlocality without entanglement depending on nonzero prior probabilities in optimal unambiguous discrimination
title_short	Quantum nonlocality without entanglement depending on nonzero prior probabilities in optimal unambiguous discrimination
title_full	Quantum nonlocality without entanglement depending on nonzero prior probabilities in optimal unambiguous discrimination
title_fullStr	Quantum nonlocality without entanglement depending on nonzero prior probabilities in optimal unambiguous discrimination
title_full_unstemmed	Quantum nonlocality without entanglement depending on nonzero prior probabilities in optimal unambiguous discrimination
title_sort	quantum nonlocality without entanglement depending on nonzero prior probabilities in optimal unambiguous discrimination
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/7d59afc6718d492bbbbaf975c1ace30a
work_keys_str_mv	AT donghoonha quantumnonlocalitywithoutentanglementdependingonnonzeropriorprobabilitiesinoptimalunambiguousdiscrimination AT jeongsankim quantumnonlocalitywithoutentanglementdependingonnonzeropriorprobabilitiesinoptimalunambiguousdiscrimination
_version_	1718389274766737408

Quantum nonlocality without entanglement depending on nonzero prior probabilities in optimal unambiguous discrimination

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