Phys. Rev. Lett. 80, 5239–5242 (1998)Mixed-State Entanglement and Distillation: Is there a “Bound” Entanglement in Nature?Received 29 January 1998; published in the issue dated 15 June 1998 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. A possible physical meaning of the result is discussed. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.5239
DOI:
10.1103/PhysRevLett.80.5239
PACS:
03.65.Bz
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