使用无噪声线性放大器提高自参考连续变量量子密钥分发的最大传输距离
Improving the Maximum Transmission Distance of Self-Referenced Continuous-Variable Quantum Key Distribution Using a Noiseless Linear Amplifier.
作者信息
Wang Yijun, Wang Xudong, Huang Duan, Guo Ying
机构信息
School of Information Science and Engineering, Central South University, Changsha 410083, China.
School of IOT Engineering, Taihu University, Wuxi 214064, China.
出版信息
Entropy (Basel). 2018 Jun 14;20(6):461. doi: 10.3390/e20060461.
We show that a noiseless linear amplifier (NLA) can be placed properly at the receiver's end to improve the performance of self-referenced (SR) continuous variable quantum key distribution (CV-QKD) when the reference pulses are weak. In SR CV-QKD, the imperfections of the amplitude modulator limit the maximal amplitude of the reference pulses, while the performance of SR CV-QKD is positively related to the amplitude of the reference pulses. An NLA can compensate the impacts of large phase noise introduced by the weak reference pulses. Simulation results derived from collective attacks show that this scheme can improve the performance of SR CV-QKD with weak reference pulses, in terms of extending maximum transmission distance. An NLA with a gain of can increase the maximum transmission distance by the equivalent of 20log10g dB of losses.
我们表明，当参考脉冲较弱时，可在接收器端适当放置一个无噪声线性放大器（NLA），以提高自参考（SR）连续变量量子密钥分发（CV-QKD）的性能。在SR CV-QKD中，幅度调制器的不完善限制了参考脉冲的最大幅度，而SR CV-QKD的性能与参考脉冲的幅度呈正相关。一个NLA可以补偿弱参考脉冲引入的大相位噪声的影响。来自集体攻击的仿真结果表明，该方案在扩展最大传输距离方面，可以提高具有弱参考脉冲的SR CV-QKD的性能。一个增益为g的NLA可以将最大传输距离增加相当于20log10g dB的损耗。
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