基于Bloch-Messiah分解的Escherich-Dropper熵计算
Evaluating the Eavesdropper Entropy via Bloch-Messiah Decomposition
摘要：
本文利用高斯幺正的布洛赫-弥赛亚分解分析了窃听者对离散调制连续变量量子密钥分配系统的纠缠克隆攻击。这种分解允许将窃听和追踪Bob模式产生的非线性酉变换替换为单模操作（挤压器、移相器和位移）和双模分束器的架构。基于这样的架构，我们能够得到更严格的上限窃听熵的离散调制CVQKD方案。新的界限是合理的高斯极值属性有效的纠缠为基础的等效协议。
英文摘要：
We explore the Bloch-Messiah decomposition of Gaussian unitary to analyze the Entangling Cloner Attack performed by an eavesdropper on a discrete modulated continuous variable QKD scenario. Such a decomposition allows to replace the nonlinear unitary resulting from eavesdropping and tracing out Bob's mode into an architecture of single-mode operations (squeezers, phase shifters and displacements) and a two-mode beam splitter. Based on such architecture we were able to get tighter upper bounds to the eavesdropper entropy for a discrete modulated CVQKD scheme. The new bounds are justified from the Gaussian extremality property valid for entangled-based equivalent protocols.
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