1110.4960 (Anthony Leverrier)

A symmetrization technique for continuous-variable quantum key
distribution    [PDF]

Anthony Leverrier

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.

View original: http://arxiv.org/abs/1110.4960