Multipartite secret key distillation and bound entanglement
Quantum Physics
2015-05-13 v3
Abstract
Recently it has been shown that quantum cryptography beyond pure entanglement distillation is possible and a paradigm for the associated protocols has been established. Here we systematically generalize the whole paradigm to the multipartite scenario. We provide constructions of new classes of multipartite bound entangled states, i.e., those with underlying twisted GHZ structure and nonzero distillable cryptographic key. We quantitatively estimate the key from below with help of the privacy squeezing technique.
Cite
@article{arxiv.0811.3603,
title = {Multipartite secret key distillation and bound entanglement},
author = {Remigiusz Augusiak and Pawel Horodecki},
journal= {arXiv preprint arXiv:0811.3603},
year = {2015}
}
Comments
Revtex, 24 pages, 7 figures, minor improvements, proof of Theorem III.2 corrected, some references added, accepted for publication in Physical Review A