摘要
大气信道传输过程引入的畸变相位严重限制了基于自由空间的轨道角动量(OAM)量子密钥分发的安全传输距离,为了实现畸变相位的实时监测和补偿,基于自适应光学技术提出一种实时跟踪补偿的OAM编码的测量设备无关量子密钥分发(OAM-MDI-QKD)方案.方案采用波前补偿和相位共轭,设计了双重补偿的自适应光学系统;采用单一光源的结构,解决了双光源的波长模式不匹配问题;利用OAM进行编码,解决了传统MDI-QKD的测量基参考系对不准问题.仿真结果表明:在信道损耗相同的情况下,本方案的损耗容错比传统的MDI-QKD方案高42 dB,比无补偿的OAM-MDI-QKD方案高2 dB.
Distortion phase introduced in atmospheric channel transmission seriously limits the secure transmission distance of orbital angular momentum(OAM) quantum key distribution based on free space. In order to realize real-time monitoring and compensation of distortion phase, based on adaptive optics technology, a measurement-device-independent quantum key distribution (OAM-MDI-QKD) scheme for real-time tracking compensation of OAM coding is proposed. Wavefront compensation and phase conjugation, are used to design an adaptive optical system with double compensation. The structure of a single light source is used to solve the problem of wavelength mode mismatch between two light sources. The problem of inaccuracy in the measurement reference frame of traditional MDI-QKD is solved by coding with OAM. The simulation results show that the loss tolerance of the proposed scheme is 42 dB higher than that of the traditional MDI-QKD scheme and 2 dB higher than that of the uncompensated OAM-MDI-QKD scheme under the same channel loss.
作者
何翼龙
郭邦红
HE Yilong;GUO Banghong(School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510631, China;School of Computer Science & Software Engineering, Shenzhen University, Shenzhen Guangdong 518060, China)
出处
《光通信技术》
北大核心
2019年第8期42-46,共5页
Optical Communication Technology
基金
国家自然科学基金面上项目(No.61572203)资助
广东省重点领域研发计划(No.2018B030325002)资助
瞬态光学与光子技术国家重点实验室开放基金(No.SKLST201602)资助
中国科学院量子信息重点实验室项目(No.KQI201508)资助
关键词
测量设备无关量子密钥分发
轨道角动量
自适应光学补偿
安全码率
measurement-device-independent quantum key distribution
OAM
adaptive optical compensation
security bit rate
