Optimum unambiguous discrimination of two mixed quantum states

Details Optimum unambiguous discrimination of two mixed quantum states Optimum unambiguous discrimination of two mixed quantum states

2005-02-18

arxiv.org/abs/quant-ph/0502117v2

Phys. Rev. A 71, 050301(R) (2005)

Physics

Quantum Physics

final version

Scientific paper

10.1103/PhysRevA.71.050301

We investigate generalized measurements, based on positive-operator-valued measures, and von Neumann measurements for the unambiguous discrimination of two mixed quantum states that occur with given prior probabilities. In particular, we derive the conditions under which the failure probability of the measurement can reach its absolute lower bound, proportional to the fidelity of the states. The optimum measurement strategy yielding the fidelity bound of the failure probability is explicitly determined for a number of cases. One example involves two density operators of rank d that jointly span a 2d-dimensional Hilbert space and are related in a special way. We also present an application of the results to the problem of unambiguous quantum state comparison, generalizing the optimum strategy for arbitrary prior probabilities of the states.

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