随机多元基量子安全直接通信

Random multiple-base quantum secure direct communication

根据量子通信系统安全性要求较高的特点,提出了单光子的随机多元基的偏振校正方案,可以完成各个偏振角度误差的补偿。与利用强光的补偿方案相比,窃听者更难获得基的信息,因此保密性更好。在测量基校正的基础上,针对传统多态量子通信系统筛选后有效信息少的缺点,设计了随机多元基的量子安全直接通信协议。该协议与窃听者Eve的互信息量很低;结合校验序列和一次一密,在信道不安全的情况下,窃听者不能得到有效信息,具有安全性好、易于实现、通信距离远等优点。

A means for measuring the polarization angle difference between the sender and the receiver to preprocess polarization states is required. A single photon base correction method to preprocess every base is presented to enhance system security. Based on the single photon, a multiple-base quantum secure direct communication protocol is proposed. The protocol can overcome the disadvantages of low sifted information in traditional multi-state system. The mutual information between the sender and eavesdropper is very low because that the random base is adopted to construct the multi-state system. Due to the use of checking sequence and One-Time-Pad, even if the eavesdropper gets the random sequence, the information sequence is still secure. This protocol possesses the advantages of higher security, easier implementation and longer communication distance.