W-like bound entangled states and secure key distillation

Details W-like bound entangled states and secure key distillation W-like bound entangled states and secure key distillation

2008-11-21

arxiv.org/abs/0811.3607v3

Europhysics Letters 85, 50001 (2009)

Physics

Quantum Physics

Revtex, 7 pages, 3 figures, published version with updated references

Scientific paper

10.1209/0295-5075/85/50001

We construct multipartite entangled states with underlying W-type structure satisfying positive partial transpose (PPT) condition under any (N-1)|1 partition. Then we show how to distill N-partite secure key form the states using two different methods: direct application of local filtering and novel random key distillation scheme in which we adopt the idea form recent results on entanglement distillation. Open problems and possible implications are also discussed.

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