Unconditional optimality of Gaussian attacks against continuous-variable quantum key distribution

被引:450
|
作者
Garcia-Patron, Raul [1 ]
Cerf, Nicolas J. [1 ]
机构
[1] Univ Libre Bruxelles, QuIC, Ecole Polytech, CP 165, B-1050 Brussels, Belgium
关键词
Quantum theory;
D O I
10.1103/PhysRevLett.97.190503
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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 collective eavesdropping strategies. 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 [M. M. Wolf , Phys. Rev. Lett. 96, 080502 (2006)].
引用
收藏
页数:4
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