Mixed-State Entanglement and Distillation: Is there a “Bound” Entanglement in Nature?
@article{Horodecki1998MixedStateEA, title={Mixed-State Entanglement and Distillation: Is there a “Bound” Entanglement in Nature?}, author={Michal Horodecki and Paweł Horodecki and Ryszard Horodecki}, journal={Physical Review Letters}, year={1998}, volume={80}, pages={5239-5242} }
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.
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