Locking and unlocking of quantum nonlocality without entanglement in local discrimination of quantum states

The phenomenon of nonlocality without entanglement (NLWE) arises in discriminating multi-party quantum separable states. Recently, it has been found that the post-measurement information about the prepared subensemble can lock or unlock NLWE in minimum-error discrimination of non-orthogonal separabl...

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Bibliographic Details
Published inScientific reports Vol. 12; no. 1; p. 3961
Main Authors Ha, Donghoon, Kim, Jeong San
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 10.03.2022
Nature Publishing Group
Nature Portfolio
Subjects
639/766/259
639/766/483
Discrimination
Humanities and Social Sciences
multidisciplinary
Science
Science (multidisciplinary)
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Summary:The phenomenon of nonlocality without entanglement (NLWE) arises in discriminating multi-party quantum separable states. Recently, it has been found that the post-measurement information about the prepared subensemble can lock or unlock NLWE in minimum-error discrimination of non-orthogonal separable states. Thus It is natural to ask whether the availability of the post-measurement information can influence on the occurrence of NLWE even in other state-discrimination strategies. Here, we show that the post-measurement information can be used to lock as well as unlock the occurrence of NLWE in terms of optimal unambiguous discrimination. Our results can provide a useful application for hiding or sharing information based on non-orthogonal separable states.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-07930-w