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Improved discrimination of unitaries by entangled probes
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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.
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Cited by 2 Pith papers
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Entanglement in quantum channel discrimination: sometimes less is more
The paper shows that for some pairs of unitary channels, perfect discrimination is possible with separable states but nearly impossible with maximally entangled states, introducing MEWC and MEBC concepts.
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Probabilistic exact universal quantum circuits for transforming unitary operations
The paper derives optimal success probabilities and no-go thresholds for probabilistically transforming unknown unitary operations into their transpose, complex conjugate, or inverse, and proves adaptive circuits give...
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