A note on generalized concurrences and entanglement detection
Quantum Physics
2008-07-23 v3
Abstract
We study generalized concurrences as a tool to detect the entanglement of bipartite quantum systems. By considering the case of 2 X 4 states of rank 2, we prove that generalized concurrences do not, in general, give a necessary and sufficient condition of separability. We identify a set of entangled states which are undetected by this method.
Cite
@article{arxiv.0804.3620,
title = {A note on generalized concurrences and entanglement detection},
author = {Laura Cattaneo and Domenico D'Alessandro},
journal= {arXiv preprint arXiv:0804.3620},
year = {2008}
}
Comments
It replaces two previous versions. The new version incorporates important references on the topic. It corrects a mistake. Title has changed