Discrimination with error margin between two states - Case of general occurrence probabilities -

Abstract

We investigate a state discrimination problem which interpolates minimum-error and unambiguous discrimination by introducing a margin for the probability of error. We closely analyze discrimination of two pure states with general occurrence probabilities. The optimal measurements are classified into three types. One of the three types of measurement is optimal depending on parameters (occurrence probabilities and error margin). We determine the three domains in the parameter space and the optimal discrimination success probability in each domain in a fully analytic form. It is also shown that when the states to be discriminated are multipartite, the optimal success probability can be attained by local operations and classical communication. For discrimination of two mixed states, an upper bound of the optimal success probability is obtained.

Final version, 9 pages, references added, presentation improved

References in corpus (6)

• Maximum Confidence Quantum Measurements
• Unambiguous discrimination of mixed states
• State discrimination with error margin and its locality
• Optimal conclusive discrimination of two states can be achieved locally
• Optimal bounded-error strategies for projective measurements in non-orthogonal state discrimination
• Unambiguous discrimination of mixed states: A description based on system-ancilla coupling

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