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Blind channel estimation for continuous‐variable quantum key distribution

机译：盲的信道估计连续变量量子密钥分发

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Summary For the maximum‐likelihood parameter estimation (MPE) of continuous‐variable quantum key distribution (CVQKD), it sacrifices partial key when estimating the channel parameters, and when the channel is varying, even slowly, legitimate communication parties must constantly exchange partial input signal and output signal to update the channel estimation. Therefore, the MPE leads to the following problems in practical application: (a) MPE achieved by randomly sampling the states can not accurately reflect the dynamic channel; (b) there exist a trade‐off between the secret key rate (SKR) and the accuracy of parameter estimation in the finite‐size regime; and (c) information leakage may be caused by the correlation between key variables. In this article, a novel parameter estimation method for CVQKD is proposed without affecting the security, and the consistency between the method and the physical model is given. Experimental simulation results show that the method can effectively improve the SKR and secure propagation distance. The experimental verification of the proposed method is given through the fiber system. Besides, the security analysis demonstrates that the method is secure against entanglement‐distillation attack.
机译：总结的最大似然参数估计(MPE)的连续变量量子密钥分发(CVQKD),牺牲部分信道参数估计的关键时候,当通道不同,甚至慢慢地,合法通信双方必须不断交换部分的输入信号和输出信号更新信道估计。在实际迈普导致以下问题应用范围:(a)迈普通过随机抽样的州不能准确反映动态通道;之间的秘密密钥(SKR)和速度参数估计的精度有限大小应承担的政权;可能是由于键之间的关系变量。CVQKD估计方法提出了没有影响安全性和一致性方法和物理模型考虑到。该方法可以有效地提高SKR和安全的传播距离。该方法的验证通过光纤系统。分析表明,该方法是安全的对纠缠量蒸馏攻击。

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