Qubit and Entanglement assisted Optimal Entanglement Concentration

Details Qubit and Entanglement assisted Optimal Entanglement Concentration Qubit and Entanglement assisted Optimal Entanglement Concentration

1999-11-04

arxiv.org/abs/quant-ph/9911013v4

Phys. Rev. A 62, 032308 (2000)

Physics

Quantum Physics

Latex, 12 pages: Enlarged version: To appear in Phys. Rev. A. Changes made: another protocol added, practical implementation o

Scientific paper

10.1103/PhysRevA.62.032308

We present two method 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 which is again optimally efficient even for a single pair. We also discuss concentrating entanglement from N-partite cat like states.

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