Geometric measure of entanglement for multipartite quantum states
Abstract
The degree to which a pure quantum state is entangled can be characterized by the distance or angle to the nearest unentangled state. This geometric measure of entanglement, already present in a number of settings [A. Shimony, Ann. NY. Acad. Sci. 755, p.675 (1995) and H. Barnum and N. Linden, J. Phys. A: Math. Gen. 34, p.6787 (2001)], is explored for bipartite and multipartite pure and mixed states. It is determined for arbitrary twoqubit mixed states and for generalized Werner and isotropic states, and is also applied to certain multipartite mixed states.
 Publication:

arXiv eprints
 Pub Date:
 December 2002
 arXiv:
 arXiv:quantph/0212030
 Bibcode:
 2002quant.ph.12030W
 Keywords:

 Quantum Physics
 EPrint:
 4 pages, 3 figures