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Published on: May 30, 2014
Locking and unlocking of quantum nonlocality without entanglement in local discrimination of quantum states
1Department of Applied Mathematics and Institute of Natural Sciences, Kyung Hee University, Yongin, 17104, Republic of Korea.
Abstract:
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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