激光与光电子学进展, 2019, 56 (21): 212702, 网络出版: 2019-11-15
利用光放大器改进自参考连续变量量子密钥分发 
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Improvement of Self-Referenced Continuous Variable Quantum Key Distribution Using Optical Amplifier
量子光学 连续变量 量子密钥分发 光放大器 参考脉冲 相位噪声 quantum optics continuous variable quantum key distribution optical amplifier reference pulse phase noise
摘要
针对自参考连续变量量子密钥分发(SR-CV-QKD)协议传输距离还有待提升的问题,提出利用光放大器(OA)来改进系统,有效地补偿了由参考脉冲和探测器缺陷引起的相位噪声的衰减影响。通过安全性分析推导出改进后的安全码率,基于实际参数进行仿真,结果表明,利用放大器能够提升弱参考脉冲下的自参考连续变量量子密钥分发协议的性能,延长最大传输距离。
Abstract
The transmission distance of a self-referenced continuous variable quantum key distribution (SR-CV-QKD) protocol still needs to be improved. Therefore, this study proposes an optical amplifier to improve the system and effectively compensate for the attenuation of phase noise caused by reference pulse. The secret key rate is derived through security analysis. Simulation results based on practical parameters show that adding an amplifier can improve the performance of the SR-CV-QKD protocol with a weak reference pulse and extend the maximum transmission distance.
龚峰, 杨鑫, 王天一. 利用光放大器改进自参考连续变量量子密钥分发[J]. 激光与光电子学进展, 2019, 56(21): 212702. Feng Gong, Xin Yang, Tianyi Wang. Improvement of Self-Referenced Continuous Variable Quantum Key Distribution Using Optical Amplifier[J]. Laser & Optoelectronics Progress, 2019, 56(21): 212702.
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