W-like bound entangled states and secure key distillation
arXiv:0811.3607 · doi:10.1209/0295-5075/85/50001
Abstract
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.
Revtex, 7 pages, 3 figures, published version with updated references
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Cited by in corpus (5)
- Universal Limitations on Quantum Key Distribution over a Network
- Complementarity Reveals Bound Entanglement of Two Twisted Photons
- Perfect Quantum Privacy Implies Nonlocality
- Systematic entanglement concentration for unknown less-entangled three-photon W states
- Robust entanglement measure for mixed quantum states