基于SNS型双路约瑟夫森结阵驱动方法研究

根据SNS型双路约瑟夫森结阵的驱动原理以及结阵分段特点,提出了平衡三进制驱动算法,实现了双路约瑟夫森结阵偏置状态的快速计算。根据约瑟夫森结阵的偏置状态以及组合方式,采用节点电压法,准确合成了双路阶梯波交流量子电压的台阶电压值,最终实现了最小分辨率为2个结,有效位为15位的交流量子电压输出。双路交流量子电压互测实验结果表明,合成交流量子电压的最大误差为0.06 μV,双路信号同步性测试实验中,两个通道的相位差为-0.01 μrad,证明了合成双路交流量子电压具有较高的幅值准确度和相位同步性。

Research on Driving Method of SNS-type Two-way Josephson Junction Array

According to the driving principle of SNS type two-way Josephson junction and the segmentation characteristics of the array,a balanced ternary driving algorithm was proposed to realize the fast calculation of the bias state of the two-way Josephson junction array.According to the bias state and combination of Josephson junction array,the voltage value of the two-way step wave AC quantum voltage was accurately synthesized by using the node voltage method.Finally,AC quantum voltage output with a minimum resolution of 2 knots and a valid bit of 15 bits was realized.The results of two-way AC quantum voltage mutual test showed that the maximum error of the synthesized AC quantum voltage was 0.06μV,and the phase difference between the two channels was 0.02μrad,which proved that the synthesized two-way AC quantum voltage has high amplitude accuracy and good phase synchronization.