Mixed-state entanglement and distillation: is there a ``bound'' entanglement in nature?

Details Mixed-state entanglement and distillation: is there a ``bound'' entanglement in nature? Mixed-state entanglement and distillation: is there a ``bound'' entanglement in nature?

1998-01-29

arxiv.org/abs/quant-ph/9801069v1

Phys.Rev.Lett. 80 (1998) 5239-5242

Physics

Quantum Physics

RevTeX, 4 pages

Scientific paper

10.1103/PhysRevLett.80.5239

It is shown that if a mixed state can be distilled to the singlet form, it must violate partial transposition criterion [A. Peres, Phys. Rev. Lett. 76, 1413 (1996)]. It implies that there are two qualitatively different types of entanglement: ``free'' entanglement which is distillable, and ``bound'' entanglement which cannot be brought to the singlet form useful for quantum communication purposes. Possible physical meaning of the result is discussed.

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