利用诱骗信号方案进行实用的量子密钥分发

真实量子密钥分发系统中不完善的单光子源和信道损耗的存在,使得现有基于弱相干态的量子密码实验在分束攻击下并不安全,诱骗信号方案能实现基于现有技术绝对安全的量子密钥分发,并能有效提高密钥分发率和安全传输距离,因此成为近年来量子通信研究的热点问题.结合现实量子密码系统的一般模型,介绍目前几种典型的诱骗信号方案以及实验进展,综述了诱骗信号方案的发展情况和最新成果,并对未来的研究方向进行了展望.

Practical Quantum Key Distribution with Decoy State Method

Due to the imperfect single photon source and the loss channel in real-life quantum key distribution systems, most current quantum communicatign experiments based on attenuated laser pulses are insecure under photon number splitting attack. Decoy state method, which is proposed as a useful and effective way to unconditionally secure quantum key distribution grounded on current technology, has become an important branch of quantum communication in recent years. Combined with the general model of quantum key distribution system, a comprehensive review is presented about typical schemes of decoy state method. Then the experimental research on decoy state method is reviewed briefly and the future direction is prospected in the end.