A simple proof that Gaussian attacks are optimal among collective attacks against continuous-variable quantum key distribution with a Gaussian modulation

Details A simple proof that Gaussian attacks are optimal among collective attacks against continuous-variable quantum key distribution with a Gaussian modulation A simple proof that Gaussian attacks are optimal among collective attacks against continuous-variable quantum key distribution with a Gaussian modulation

2009-12-21

arxiv.org/abs/0912.4132v2

Phys. Rev. A 81, 062314 (2010)

Physics

Quantum Physics

6 pages, appendix added

Scientific paper

10.1103/PhysRevA.81.062314

In this paper, we give a simple proof of the fact that the optimal collective
attacks against continous-variable quantum key distribution with a Gaussian
modulation are Gaussian attacks. Our proof makes use of symmetry properties of
the quantum key distribution protocol in phase-space.

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