Multipartite secret key distillation and bound entanglement

Paweł Horodecki; Remigiusz Augusiak

Multipartite secret key distillation and bound entanglement

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 Greenberger-Horne-Zeilinger (GHZ) structure and nonzero distillable cryptographic key. We quantitatively estimate the key from below with the help of the privacy squeezing technique.

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Publication version: Accepted or Published Version
License: Copyright (2009 The American Physical Society)

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: PHYSICAL REVIEW A no. 80, pages 0 - 22,
ISSN: 2469-9926
Language:: English
Publication year:: 2009
Bibliographic description:: Horodecki P., Augusiak R.: Multipartite secret key distillation and bound entanglement// PHYSICAL REVIEW A. -Vol. 80, nr. iss. 4 (2009), s.0-22
Verified by:: Gdańsk University of Technology