Postmeasurement information and nonlocality of quantum state discrimination

Abstract:In quantum state discrimination, nonlocality arises when optimal discrimination cannot be achieved using only local operations and classical communication. It has recently been shown that postmeasurement information identifying the subensemble containing the prepared state can either annihilate or create such nonlocality. Here, we demonstrate that these effects can depend critically on how the original ensemble is partitioned into subensembles. We derive sufficient conditions under which different ensemble partitions lead to the annihilation or creation of nonlocality upon the revelation of postmeasurement information. We further construct explicit bipartite quantum state ensembles satisfying these conditions, thereby illustrating the partition-dependent nature of nonlocality in quantum state discrimination.

arXiv:2412.17435 [quant-ph]

(or arXiv:2412.17435v2 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2412.17435 Focus to learn more arXiv-issued DOI via DataCite

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