On exposed positive maps: Robertson and Breuer-Hall maps
Quantum Physics
2011-08-11 v1 Mathematical Physics
math.MP
Abstract
It is well known that so called Breuer-Hall positive maps used in entanglement theory are optimal. We show that these maps possess much more subtle property --- they are exposed. As a byproduct it proves that a Robertson map in the algebra of 4 x 4 complex matrices is not only extreme, which was already shown by Robertson, but also exposed.
Cite
@article{arxiv.1108.2233,
title = {On exposed positive maps: Robertson and Breuer-Hall maps},
author = {Dariusz Chruściński},
journal= {arXiv preprint arXiv:1108.2233},
year = {2011}
}
Comments
7 pages