Improved discrimination of unitaries by entangled probes
Quantum Physics
2009-11-07 v1
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.
Keywords
Cite
@article{arxiv.quant-ph/0204050,
title = {Improved discrimination of unitaries by entangled probes},
author = {G. Mauro D'Ariano and Paoloplacido Lo Presti and Matteo G. A. Paris},
journal= {arXiv preprint arXiv:quant-ph/0204050},
year = {2009}
}