Extremality conditions for generalized channels
Quantum Physics
2015-06-04 v1
Abstract
A generalized channel is a completely positive map that preserves trace on a given subspace. We find conditions under which a generalized channel with respect to a positively generated subspace J is an extreme point in the set of all such generalized channels. As a special case, this yields extremality conditions for quantum protocols. In particular, we obtain new extremality conditions for quantum 1-testers with 2 outcomes, which correspond to yes/no measurements on the set of quantum channels.
Keywords
Cite
@article{arxiv.1204.2752,
title = {Extremality conditions for generalized channels},
author = {Anna Jencova},
journal= {arXiv preprint arXiv:1204.2752},
year = {2015}
}
Comments
19 pages, 3 figures