Convex-roof extended negativity as an entanglement measure for bipartite quantum systems
Quantum Physics
2009-11-10 v1
Abstract
We extend the concept of the negativity, a good measure of entanglement for bipartite pure states, to mixed states by means of the convex-roof extension. We show that the measure does not increase under local quantum operations and classical communication, and derive explicit formulae for the entanglement measure of isotropic states and Werner states, applying the formalism presented by Vollbrecht and Werner [Phys. Rev. A {\bf 64}, 062307 (2001)].
Keywords
Cite
@article{arxiv.quant-ph/0310027,
title = {Convex-roof extended negativity as an entanglement measure for bipartite quantum systems},
author = {Soojoon Lee and Dong Pyo Chi and Sung Dahm Oh and Jaewan Kim},
journal= {arXiv preprint arXiv:quant-ph/0310027},
year = {2009}
}
Comments
6 pages; accepted for publication in Physical Review A