A symmetrization technique for continuous-variable quantum key distribution

Details A symmetrization technique for continuous-variable quantum key distribution A symmetrization technique for continuous-variable quantum key distribution

2011-10-22

arxiv.org/abs/1110.4960v2

Phys. Rev. A 85, 022339 (2012)

Physics

Quantum Physics

7 pages

Scientific paper

10.1103/PhysRevA.85.022339

We introduce a symmetrization technique which can be used as an extra step in some continuous-variable quantum key distribution protocols. By randomizing the data in phase space, one can dramatically simplify the security analysis of the protocols, in particular in the case of collective attacks. The main application of this procedure concerns protocols with postselection, for which security was established only against Gaussian attacks until now. Here, we prove that under some experimentally verifiable conditions, Gaussian attacks are optimal among all collective attacks.

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