Phys. Rev. A 62, 032308 (2000) [7 pages]Qubit- and entanglement-assisted optimal entanglement concentrationReceived 23 November 1999; published 17 August 2000 We present two methods for optimal entanglement concentration from pure entangled states by local actions only. However, a prior knowledge of the Schmidt coefficients is required. The first method is optimally efficient only when a finite ensemble of pure entangled states are available, whereas the second method realizes the single pair optimal concentration probability. We also propose an entanglement-assisted method that is again optimally efficient even for a single pair. We also discuss concentrating entanglement from N-partite catlike states. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.62.032308
DOI:
10.1103/PhysRevA.62.032308
PACS:
03.67.-a
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