Entanglement measures: state ordering vs local operations
Abstract
A set of all states of a bi-partite quantum system can be divided into subsets each of which contains states with the same degree of entanglement. In this paper we address a question whether local operations (without classical communication) affect the entanglement-induced state ordering. We show that arbitrary unilocal channel (i.e., a channel that acts on one sub-system of a bi-partite system only) might change the ordering for an arbitrary nontrivial measure of entanglement. A slightly weaker result holds for the maximally entangled states. In particular, the maximally entangled states might not remain the most entangled ones at the output of a unilocal noise channel.
Cite
@article{arxiv.0707.4401,
title = {Entanglement measures: state ordering vs local operations},
author = {Mario Ziman and Vladimir Buzek},
journal= {arXiv preprint arXiv:0707.4401},
year = {2007}
}
Comments
9 pages, 1 figure, presented at NATO Advanced Research Workshop on Quantum Communication and Security (September 2006, Gdansk, Poland)