Quantum key distillation from Gaussian states by Gaussian operations
Navascués, M. (Institut de Ciències Fotòniques)
Bae, J. (Institut de Ciències Fotòniques)
Cirac Sasturáin, Juan Ignacio, 1965- (Max-Planck Institut für Quantenoptik)
Lewestein, Maciej (Institut de Ciències Fotòniques)
Sanpera Trigueros, Anna (Institut de Ciències Fotòniques)
Acín, Antonio (Institut de Ciències Fotòniques)
American Physical Society

Date:	2005
Abstract:	We study the secrecy properties of Gaussian states under Gaussian operations. Although such operations are useless for quantum distillation, we prove that it is possible to distill a secret key secure against any attack from sufficiently entangled Gaussian states with nonpositive partial transposition. Moreover, all such states allow for key distillation, when Eve is assumed to perform finite-size coherent attacks before the reconciliation process.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; Versió publicada
Published in:	Physical review letters, Vol. 94, Issue 1 (January 2005) , p. 010502, ISSN 1079-7114

DOI: 10.1103/PhysRevLett.94.010502

4 p, 107.7 KB

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