Distillability via protocols respecting the positivity of partial transpose
Tilo Eggeling, Karl Gerd H. Vollbrecht, Reinhard F. Werner, Michael M. Wolf
Abstract
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 NPT bound entanglement exist is therefore closely related to the connection between the set of separable superoperators and PPT-preserving maps.
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