Convex-roof extended negativity as an entanglement measure for bipartite quantum systems

Details Convex-roof extended negativity as an entanglement measure for bipartite quantum systems Convex-roof extended negativity as an entanglement measure for bipartite quantum systems

2003-10-04

arxiv.org/abs/quant-ph/0310027v1

Phys. Rev. A 68, 062304 (2003)

Physics

Quantum Physics

6 pages; accepted for publication in Physical Review A

Scientific paper

10.1103/PhysRevA.68.062304

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)].

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