基于SNS型双路约瑟夫森结阵驱动方法研究  

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

作　　者：周天地 贾正森[1] 王磊[1] 徐熙彤 潘仙林[1] 石照民 ZHOU Tian-di;JIA Zheng-sen;WANG Lei;XU Xi-tong;PAN Xian-lin;SHI Zhao-min(Division of Electricity and Magnetism,National Institute of Metrology,Beijing 100029,China)

机构地区：[1]中国计量科学研究院电磁计量科学技术研究所,北京100029

出　　处：《计量学报》2020年第3期290-295,共6页Acta Metrologica Sinica

基　　金：国家高科技研究发展计划(2015AA050404);国家自然科学基金(51877202)。

摘　　要：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0.06μV,双路信号同步性测试实验中,两个通道的相位差为-0.01μrad,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。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.

关 键 词：计量学 量子电压 SNS型双路约瑟夫森结阵 平衡三进制 节点电压法 

分 类 号：TB971[一般工业技术—计量学]