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Multiparticle entanglement purification protocols

1998; American Physical Society; Volume: 57; Issue: 6 Linguagem: Inglês

10.1103/physreva.57.r4075

1538-4446

Mio Murao, Martin B. Plenio, Ştefan Popescu, Vlatko Vedral, P. L. Knight,

Quantum Computing Algorithms and Architecture

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 than relying on two-particle purification.