Optimal entanglement witnesses based on local orthogonal observables
Quantum Physics
2009-11-13 v3
Abstract
We show that the entanglement witnesses based on local orthogonal observables which are introduced in [S. Yu and N.-L. Liu, Phys. Rev. Lett. 95, 150504 (2005)] and [O. G\"uhne, M. Mechler, G. T\'oth and P. Adam, Phys. Rev. A 74, 010301 (2006)] in linear and nonlinear forms can be optimized, respectively. As applications, we calculate the optimal nonlinear witnesses of pure bipartite states and show a lower bound on the I-concurrence of bipartite higher dimensional systems with our method.
Keywords
Cite
@article{arxiv.0705.1832,
title = {Optimal entanglement witnesses based on local orthogonal observables},
author = {Cheng-Jie Zhang and Yong-Sheng Zhang and Shun Zhang and Guang-Can Guo},
journal= {arXiv preprint arXiv:0705.1832},
year = {2009}
}
Comments
6 pages, 1 figure; minor changes, references added