Improved discrimination of unitaries by entangled probes

Abstract

We consider the problem of discriminating among a set of unitaries by means of measurements performed on the state undergoing the transformation. We show that use of entangled probes improves the discrimination in the two following cases: i) for a set of unitaries that are the UIR of a group and, ii) for any pair of transformations provided that multiple uses of the channel are allowed.

References in corpus (3)

• Statistical distinguishability between unitary operations
• Using entanglement improves precision of quantum measurements
• Optimal estimation of quantum dynamics

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