Security of continuous-variable QKD: exploiting symmetries in phase space

Details Security of continuous-variable QKD: exploiting symmetries in phase space Security of continuous-variable QKD: exploiting symmetries in phase space

2009-07-21

arxiv.org/abs/0907.3696v1

New Journal of Physics, 11, 115009 (2009)

Physics

Quantum Physics

13 pages

Scientific paper

10.1088/1367-2630/11/11/115009

Proving the unconditional security of a quantum key distribution (QKD) scheme is a highly challenging task as one needs to determine the most efficient attack compatible with experimental data. This task is even more demanding for continuous-variable QKD as the Hilbert space where the protocol is described is infinite dimensional. A very natural way to address this problem is to make an extensive use of the symmetries of the protocols. In this article, we investigate a symmetry in phase space that is particularly relevant to continuous-variable QKD, and explore the way towards a new quantum de Finetti theorem that would exploit this symmetry and provide a powerful tool to assess the security of continuous-variable protocols.

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