Qubit and Entanglement assisted Optimal Entanglement Concentration

Abstract

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.

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

References in corpus (5)

• A Multiparticle Generalization of Entanglement Swapping
• Purification via entanglement swapping and conserved entanglement
• Entanglement in Quantum Information Theory
• Multi-Particle Entanglement Purification Protocols
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Cited by in corpus (4)

• Protocols and quantum circuits for implementing entanglement concentration in cat state, GHZ-like state and 9 families of 4-qubit entangled states
• Entanglement Distillation; A Discourse on Bound Entanglement in Quantum Information Theory
• Local Transformations of Multiple Multipartite States
• Signaling versus distinguishing different superpositions of same pure quantum state