HP Labs Technical Reports

Multi-Particle Entanglement Purification Protocols

Murao, M.; Plenio, M.B.; Vedral, V.; Knight, P.; Popescu, Sandu

HPL-BRIMS-98-01

Keyword(s): quantum non-locality; entanglement quantum information; quantum computation; quantum mechanics

Abstract: Purification schemes for multi-particle entangled states cannot be treated as straightforward extensions of those for two particles because of the lack of symmetry they possess. We propose purification protocols for a wide range of mixed entangled states of many particles. These are useful for understanding entanglement, and will be of practical significance in multi-user cryptographic schemes or distributed quantum computation and communication. We show that operating locally on multi-particle entangled states directly is more efficient that relying on two- particle purification. PACS numbers: 03.67.-a,03.67.Hk

5 Pages

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