摘要
在双M-Z干涉仪系统上采用跟踪相位变化适时进行密钥分配,实现了80 km稳定的量子保密通信,误码率≈6.0%,50 km以下误码率<3.5%,稳定时间达数天,并且通过局域网实现了密钥分发和文档传送。该方案用于其它量子密钥分配(QKD)系统也可提高稳定性,向实用化又迈进了一步。
By tracking phase drift and distributing key at suitable times, the quantum key distribution based on double M-Z interferometer was performed over a fiber length of 80 km with a quantum bit-error rate of 6%, and it had been working stably for several days. In addition,we demonstrate that the quantum bit-error rate is less than 3.5^ within a fiber length of 50 km. Through the local-area network,the key exchange and document transmission were achieved. The scheme applicable to other QKD systems can also improve the stability of interference,which has made progress in the practical application.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2007年第6期687-689,共3页
Journal of Optoelectronics·Laser
基金
国家"973"计划资助项目(2001CB309300)
广州市资助项目(1999-02-035-01)
