Unconditional optimality of Gaussian attacks against continuous-variable QKD

Details Unconditional optimality of Gaussian attacks against continuous-variable QKD Unconditional optimality of Gaussian attacks against continuous-variable QKD

2006-08-03

arxiv.org/abs/quant-ph/0608032v1

Phys. Rev. Lett. 97, 190503 (2006).

Physics

Quantum Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.97.190503

A fully general approach to the security analysis of continuous-variable quantum key distribution (CV-QKD) is presented. Provided that the quantum channel is estimated via the covariance matrix of the quadratures, Gaussian attacks are shown to be optimal against all eavesdropping strategies, including collective and coherent attacks. The proof is made strikingly simple by combining a physical model of measurement, an entanglement-based description of CV-QKD, and a recent powerful result on the extremality of Gaussian states [Phys. Rev. Lett. 96, 080502 (2006)].

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