arXiv:quant-ph/0611095AbstractReferencesReviewsResources
Unambiguous discrimination of mixed states: A description based on system-ancilla coupling
Xiang-Fa Zhou, Yong-Sheng Zhang, Guang-Can Guo
Published 2006-11-09, updated 2007-05-11Version 2
We propose a general description on the unambiguous discrimination of mixed states according to the system-environment coupling, and present a procedure to reduce this to a standard semidefinite programming problem. In the two states case, we introduce the canonical vectors and partly simplify the problem to the case of discrimination between pairs of canonical vectors. By considering the positivity of the two by two matrices, we obtain a series of new upper bounds of the total success probability which depends on both the prior probabilities and specific state structures.
Comments: 6 pages, 1 table, added some examples
Journal: Phys. Rev. A 75, 052314 (2007)
Categories: quant-ph
Keywords: mixed states, unambiguous discrimination, system-ancilla coupling, description, canonical vectors
Tags: journal article
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