Schmidt number witnesses and bound entanglement
Quantum Physics
2009-11-06 v2
Abstract
The Schmidt number of a mixed state characterizes the minimum Schmidt rank of the pure states needed to construct it. We investigate the Schmidt number of an arbitrary mixed state by constructing a Schmidt number witness that detects it. We present a canonical form of such witnesses and provide constructive methods for their optimization. Finally, we present strong evidence that all bound entangled states with positive partial transpose in two qutrit systems have Schmidt number 2.
Cite
@article{arxiv.quant-ph/0009109,
title = {Schmidt number witnesses and bound entanglement},
author = {Anna Sanpera and Dagmar Bruss and Maciej Lewenstein},
journal= {arXiv preprint arXiv:quant-ph/0009109},
year = {2009}
}
Comments
5 pages, Latex, no figures.Corrected version. An observation from the previous version has been withdrawn and a new proof added. Submitted for publication in PRA