Distillability via protocols respecting the positivity of partial transpose.

@article{Eggeling2001DistillabilityVP,
  title={Distillability via protocols respecting the positivity of partial transpose.},
  author={T. Eggeling and K. Vollbrecht and R. Werner and M. Wolf},
  journal={Physical review letters},
  year={2001},
  volume={87 25},
  pages={
          257902
        }
}
We show that all quantum states that do not have a positive partial transpose are distillable via channels, which preserve the positivity of the partial transpose. The question whether bound entangled states with non-positive partial transpose exist is therefore closely related to the connection between the set of separable superoperators and positive partial transpose-preserving maps. 

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