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Phys. Rev. Lett. 83, 1046–1049 (1999)

Entanglement of Pure States for a Single Copy

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Guifré Vidal*
Departament d'Estructura i Constituents de la Matèria, Universitat de Barcelona, Diagonal 647, E-08028 Barcelona, Spain

Received 25 March 1999; published in the issue dated 2 August 1999

An optimal local conversion strategy between any two pure states of a bipartite system is presented. It is optimal in that the probability of success is the largest achievable if the parties which share the system, and which can communicate classically, are only allowed to act locally on it. The study of optimal local conversions sheds some light on the entanglement of a single copy of a pure state. We propose a quantification of such an entanglement by means of a finite minimal set of new measures from which the optimal probability of conversion follows.

© 1999 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.83.1046
DOI:
10.1103/PhysRevLett.83.1046
PACS:
03.67.-a, 03.65.Bz

*Email address: guifre@ecm.ub.es