Key distillation from Gaussian states by Gaussian operations

Details Key distillation from Gaussian states by Gaussian operations Key distillation from Gaussian states by Gaussian operations

2004-05-11

arxiv.org/abs/quant-ph/0405047v2

Physics

Quantum Physics

2 figures, REVTEX4

Scientific paper

10.1103/PhysRevLett.94.010502

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 non-positive partial transposition. Moreover, all such states allow for key distillation, when Eve is assumed to perform finite-size coherent attacks before the reconciliation process.

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