Decrease of entanglement by local operations in the D\"ur-Cirac method
Quantum Physics
2007-05-23 v1
Abstract
One cannot always obtain information about entanglement by the D\"ur-Cirac (DC) method. The impracticality is attributed to the decrease of entanglement by local operations in the DC method. We show that, even in 2--qubit systems, there exist states whose entangled property the DC method never evaluates. The class of such states in 2--qubit systems is completely characterized by the value of the fully entangled fraction. Actually, a state whose fully entangled fraction is less than or equal to 1/2 is always transformed into a separable state by local operations in the DC method, even if it has negative partial transposition.
Cite
@article{arxiv.0704.1375,
title = {Decrease of entanglement by local operations in the D\"ur-Cirac method},
author = {Yukihiro Ota and Motoyuki Yoshida and Ichiro Ohba},
journal= {arXiv preprint arXiv:0704.1375},
year = {2007}
}
Comments
5 pages