欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
受偏振模色散的影响，单光子偏振态在光纤传输过程中会发生随机缓变，从而在接收端引起误码增加。为保证密钥分发的顺利进行，必须有一种精确的偏振角旋转测量方法，以便对发送偏振态进行预校正．论文将双平衡探测结构引入BB84模型中，利用半正定算子值测量建立了接收端在偏振模影响下的误码率模型．其中双平衡结构利用Wollaston棱镜检测偏转角，并用双路输出消除探测器误差带来的影响，可使分辨率提高到0．1。．利用误码率模型计算表明，这种新的密钥分发方法可将误码率降低至3．05×10^-6．
英文摘要：
Affected by PMD（Polarization Mode Dispersion）, the polarization state of the single photon will be randomly and slowly altered during the transmission in the fiber. This increases the error probability at the receiving end. So a means for measuring the variance to the preprocess polarization state is required for the distribution of the quantum key. A sensor with balanced detection is introduced to the BB84 protocol and the theoretical model of the QBER （Quantum Bit Error Rate） is established with POVM （Positive Operator Valued Measurement）. The variance of the polarization state is measured with the Wollaston prism and the error is eliminated for the dual channel. The angle tolerance of the Wollaston prism is 0. 1^o and the numerical analysis by the use of the QBER model shows the new protocol decreases the error rate to 3.05 × 10-6.
同期刊论文项目
同项目期刊论文
位置：