Extremal Channels for a genaral Quantum system
Quantum Physics
2009-09-22 v1
Abstract
Quantum channels can be mathematically represented as completely positive trace-preserving maps that act on a density matrix. A general quantum channel can be written as a convex sum of `extremal' channels. We show that for an -level system, the extremal channel can be characterized in terms of - real parameters coupled with rotations. We give a representation for = 2, 3, 4.
Cite
@article{arxiv.0909.3744,
title = {Extremal Channels for a genaral Quantum system},
author = {Kuldeep Dixit and E. C. G. Sudarshan},
journal= {arXiv preprint arXiv:0909.3744},
year = {2009}
}
Comments
3 pages, 1 figure