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)10.1103/PhysRevLett.96.080502].
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机译：提出了一种完全通用的连续变量量子密钥分配（CV-QKD）安全性分析方法。假设通过正交协方差矩阵来估计量子信道，那么高斯攻击对于所有集体窃听策略都是最优的。通过结合物理测量模型，基于纠缠的CV-QKD描述以及最近关于高斯态极值的有力结果，可以使证明极其简单。 M. Wolf，物理学。牧师96，080502（2006）10.1103 / PhysRevLett.96.080502]。
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