光纤信道压力作用下量子密钥分发误码率建模与仿真

QBER Modeling and Simulation of QKD in Optical Fiber with Force

采用半正定算子测量建立了光纤信道压力作用下的误码率分析模型.以熊猫型保偏光纤为例,用所建模型进行了数值分析.结果表明:相同作用角下,接收端误码随外界压力的增加呈上升趋势;相同压力下,除0和π/2外,接收端误码随着作用角度的增加而增加.在归一化力参量小于0.4或作用角小于π/12时,误码率小于5%.

The theoretical model of QBER （Quantum Bit Error Rate） was established with POVM （Positive Operator Valued Measurement）. PANDA fiber as an example was simulated based on the model. The research results show that under the same angle, bit error rate （BER） increases with increase of force amplitude; and BER increases with increase of angle, under the same force without the consideration of 0 and π/2. For normalized force less than 0.4 or the angle less than π/12,the BER could be lower than 5%.