Improved discrimination of unitaries by entangled probes

Details Improved discrimination of unitaries by entangled probes Improved discrimination of unitaries by entangled probes

2002-04-09

arxiv.org/abs/quant-ph/0204050v1

J. Opt. B vol 4 273 (2002)

Physics

Quantum Physics

Scientific paper

10.1088/1464-4266/4/4/304

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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