Author Affiliations
Abstract
School of Science and State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
Reference frame independent and measurement device independent quantum key distribution (RFI-MDI-QKD) has the advantages of being immune to detector side loopholes and misalignment of the reference frame. However, several former related research works are based on the unrealistic assumption of perfect source preparation. In this paper, we merge a loss-tolerant method into RFI-MDI-QKD to consider source flaws into key rate estimation and compare it with quantum coin method. Based on a reliable experimental scheme, the joint influence of both source flaws and reference frame misalignment is discussed with consideration of the finite-key effect. The results show that the loss-tolerant RFI-MDI-QKD protocol can reach longer key rate performance while considering the existence of source flaws in a real-world implementation.
quantum key distribution source flaw measurement device independence Chinese Optics Letters
2022, 20(9): 092701
海军工程大学电子工程学院, 湖北 武汉 430033
提出了一种基于测量设备无关协议的经典-量子信号共纤传输方案。推导了自发拉曼散射噪声计数率公式,分析了经典信号入射功率、量子信号复用路数和量子信号平均光子数对量子密钥分配性能的影响。数值仿真结果表明,当经典信号入射功率为0 dBm(即通信容量为84.8 Gbit/s)时,所提方案量子密钥分配的最大安全传输距离可达141 km;当入射功率增加到11 dBm(即通信容量为1.068 Tbit/s)时,仍然可达100 km。相比于现有的最优传输方案,所提方案量子密钥分配的最大安全传输距离延长了26 km;虽然随着经典信号入射功率的增加,量子密钥分配性能有所下降,但是可以通过采用多路量子信号复用和优化量子信号的平均光子数来进行性能补偿。
量子光学 测量设备无关 拉曼散射 经典-量子信号 激光与光电子学进展
2019, 56(8): 082701
