Bound entangled states with nonzero distillable key rate

Details Bound entangled states with nonzero distillable key rate Bound entangled states with nonzero distillable key rate

2006-12-29

arxiv.org/abs/quant-ph/0612225v4

Physics

Quantum Physics

7 pages, 1 figure, typos corrected, accepted for publication in PRA

Scientific paper

In this paper, we present sufficient conditions for states to have positive distillable key rate. Exploiting the conditions, we show that the bound entangled states given by Horodecki et al. [Phys. Rev. Lett. 94, 160502 (2005), quant-ph/0506203] have nonzero distillable key rate, and finally exhibit a new class of bound entangled states with positive distillable key rate, but with negative Devetak-Winter lower bound of distillable key rate for the ccq states of their privacy squeezed versions.

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