Mixed-State Entanglement and Distillation: Is there a “Bound” Entanglement in Nature?
- 15 June 1998
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 80 (24), 5239-5242
- https://doi.org/10.1103/physrevlett.80.5239
Abstract
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.Keywords
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