传输距离对实际量子密钥分发系统的影响

基于BB84协议原理,搭建偏振编码的长距离点对点实际量子密钥分发实验系统.利用该实验平台完成了5,10,15km 3种不同传输距离的量子密钥分发实验,并对系统主要参数实时采集进行数据分析.实验结果表明:随着发送端与接收端量子光纤信道距离的增加,在统计时间内,系统分段成码率降低,信号态和诱骗态误码率上升,系统产生的密钥量降低.

Influence of Actual Transmission Distance on Quantum Key Distribution System

A long distance peer to peer quantum key distribution experimental system of polarization encoding was built based on BB84 protocol. With the help
of this experimental platform, quantum key distribution experiment with 5,10,15 km three different transmission distances was completed and the main parameters of the system was collected in real time for data analysis. The experimental resultsshow that with the increase of quantum fiber channel distance from sending end to receiving end, the system bit generation rate and the amount of key generated by the system would drop, the bit error rate of signal state and decoy state would increase within statistical time. The experimental results have theoretical and practical value for practical development of the long range security quantum key distribution system.