水下量子密钥分配的误码率和成码率  

Bit Error Rate and Key Generation Rate for Underwater Quantum Key Distribution

作　　者：史鹏[1,2] 赵士成[1] 李文东[1] 顾永建[1] 

机构地区：[1]中国海洋大学物理系,山东青岛266100 [2]青岛理工大学理学院,山东青岛266520

出　　处：《中国海洋大学学报（自然科学版）》2017年第4期114-120,共7页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(60677044;11304174);中央高校基本科研业务费专项(201313012)资助~~

摘　　要：水下量子密钥分配可以为水下通信提供绝对安全的保密手段。水下量子密钥分配系统的误码率和成码率受到海水信道的光学性质、天气环境和通信系统硬件参数等的影响。本文从理论和实验上分析水下量子密钥分配的信道特性和系统硬件特性,估算其误码率和成码率,并给出系统参数的门限值,结果表明可在百米范围内进行绝对安全的水下量子密钥分配。As an important branch of quantum information, quantum communication with quantum states as information carriers, overcomes the security risk of the traditional cryptography, and is ＂abso- lutely safe＂ in theory. Driven by the communication requirements of underwater sensor networks, sub- marines and all kinds of underwater vehicles, underwater wireless optical communication has been devel- oping rapidly in recent years, for which underwater quantum key distribution （QKD） can provide abso- lute security. The bit error rate and key generation rate for underwater quantum key distribution system can be affected by optical properties of the sea channel, environments and parameters of the system hardware. In this paper, the seawater channel properties and the system hardware characteristics of un- derwater quantum key distribution are analyzed theoretically and experimentally in order to estimate the bit error rate and key generation rate, and the thresholds of system parameters are given after the analy- sis. Firstly, we establish and improve the model of underwater quantum channels. By programming we study the underwater transfer properties of polarized photons with computer simulation. Sceondly, we investigate the optical signal attenuation of the sea channels. Considering the influence of background noise, we estimate the error rate and the sifted key rate in underwater quantum communication. We get the error rate as a function of communication distance, and the error rate with different depths of seawa- ter in Jerlov Type I ocean water. Thirdly, we analyze the hardware characteristics of the QKD system and evaluate the effects of sources, detectors, optical devices on the performance of the system. Fourth- ly, we get the sifted key generation rate as a function of communication distance. The above research re- sults show that in the night when background noise is weak it is theoretically feasible to achieve absolute security underwater QKD within 127 meters range in the clear ocean waters with the key gen

关 键 词：水下量子密钥分配 海水信道 量子误码率 成码率 

分 类 号：E963[军事—军事通信学] O43[机械工程—光学工程]