Catalysis of entanglement manipulation for mixed states

Details Catalysis of entanglement manipulation for mixed states Catalysis of entanglement manipulation for mixed states

1999-12-16

arxiv.org/abs/quant-ph/9912080v3

Phys.Rev.Lett. 85 (2000) 437

Physics

Quantum Physics

5 pages (RevTex). Final version, to appear in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.85.437

We consider entanglement-assisted remote quantum state manipulation of bi-partite mixed states. Several aspects are addressed: we present a class of mixed states of rank two that can be transformed into another class of mixed states under entanglement-assisted local operations with classical communication, but for which such a transformation is impossible without assistance. Furthermore, we demonstrate enhancement of the efficiency of purification protocols with the help of entanglement-assisted operations. Finally, transformations from one mixed state to mixed target states which are sufficiently close to the source state are contrasted to similar transformations in the pure-state case.

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