Quantum key distillation from Gaussian states by Gaussian operations

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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.
Publisher
AMER PHYSICAL SOC
Issue Date
2005-01
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.94, no.1

ISSN
0031-9007
DOI
10.1103/PhysRevLett.94.010502
URI
http://hdl.handle.net/10203/244397
Appears in Collection
EE-Journal Papers(저널논문)
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