2003/10/04 by Soojoon Lee, Dong Pyo Chi, Sung Dahm Oh +1 · 1 citation
Physics and Astronomy · #quant-ph
paper · pdf · doi:10.1103/physreva.68.062304
published as Phys. Rev. A 68, 062304 (2003) · 6 pages; accepted for publication in Physical Review A
arxiv created 2003/10/04 · arxiv updated 2009/12/01
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)].