量子密码分配过程中的测量基问题

Analysis of basis direction deviation in quantum communication

推导了利用单量子通信系统中Alice发送基与Bob接收基方向间有偏差时双方建立的Sifted-key的误码率公式。在对公式进行考查的基础上,我们建议设立一个万有方向来统一通信双方使用的基的方向。

Studies have been made on quantum communications using single particle as the information carrier and the expression of the quantum bit error rate （QBER） of the sifted key established between Alice and Bob has been deduced when there exists an angle deference between the directions of Alice＇s basis and Bob＇s basis. To tackle the stringent requirements on the angle difference, we propose to construct a universal direction to guide the bases of the sender and the receiver.