Optimal probabilistic estimation of quantum states
作者： Jaromír Fiurášek
DOI: 10.1088/1367-2630/8/9/192
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摘要: We extend the concept of probabilistic unambiguous discrimination quantum states to state estimation. consider a scenario where measurement device can output either an estimate unknown input or inconclusive result. present general method how evaluate maximum fidelity achievable by estimation strategy. illustrate our on two explicit examples: qudit from pair conjugate qudits and phase covariant qubit N copies. show that allowing for results it is possible reach higher than best deterministic
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