Unambiguous discrimination between mixed quantum states

Publisher:
American Physical Society
Publication Type:
Journal article
Citation:
Feng Yuan, Duan Runyao, and Ying Mingsheng 2004, 'Unambiguous discrimination between mixed quantum states', American Physical Society, vol. 70, no. 1, pp. 012308-1-012308-4.
Issue Date:
2004
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We prove that the states secretly chosen from a mixed state set can be perfectly discriminated if and only if they are orthogonal. The sufficient and necessary condition under which nonorthogonal mixed quantum states can be unambiguously discriminated is also presented. Furthermore, we derive a series of lower bounds on the inconclusive probability of unambiguous discrimination of states from a mixed state set with a priori probabilities.
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