Development of 0.5-V Josephson junction array devices for quantum voltage standards

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英文篇名：Development of 0.5-V Josephson junction array devices for quantum voltage standards 作者：王兰若 ; 李劲劲 ; 曹文会 ; 钟源 ; 张钟华 英文作者：Lanruo Wang;Jinjin Li;Wenhui Cao;Yuan Zhong;Zhonghua Zhang;Department of Electrical Engineering, Tsinghua University;National Institute of Metrology;Key Laboratory of the Electrical Quantum Standard of AQSIQ; 英文关键词：Josephson voltage standards;;Josephson junction;;superconducting-normal metal–superconducting(SNS) junction;;quantum device 中文刊名：ZGWL 英文刊名：中国物理B 机构：Department of Electrical Engineering, Tsinghua University;National Institute of Metrology;Key Laboratory of the Electrical Quantum Standard of AQSIQ; 出版日期：2019-06-15 出版单位：Chinese Physics B 年：2019 期：v.28 基金：Project supported by the National Key Research and Development Program of China(Grant No.2016YFF02000402) 语种：英文; 页：ZGWL201906068 页数：5 CN：06 ISSN：11-5639/O4 分类号：453-457

摘要

The design, fabrication, and the characterization of a 0.5-V Josephson junction array device are presented for the quantum voltage standards in the National Institute of Metrology(NIM) of China. The device consists of four junction arrays, each of which has 1200 3-stacked Nb/Nb_xSi_(1-x)/Nb junctions and an on-chip superconducting microwave circuit which is mainly a power divider enabling each Josephson array being loaded with an equal amount of microwave power. A direct current(dc) quantum voltage of about 0.5 V with a ～1-mA current margin of the 1 st quantum voltage step is obtained.To further prove the quality of NIM device, a comparison between the NIM device with the National Institute of Standards and Technology(NIST) programmable Josephson voltage standard(PJVS) system device is conducted. The difference of the reproduced 0.5-V quantum voltage between the two devices is about 0.55 nV, which indicates good agreement between the two devices. With the homemade device, we have realized a precise and applicable 0.5-V applicable-level quantum voltage.
        The design, fabrication, and the characterization of a 0.5-V Josephson junction array device are presented for the quantum voltage standards in the National Institute of Metrology(NIM) of China. The device consists of four junction arrays, each of which has 1200 3-stacked Nb/Nb_xSi_(1-x)/Nb junctions and an on-chip superconducting microwave circuit which is mainly a power divider enabling each Josephson array being loaded with an equal amount of microwave power. A direct current(dc) quantum voltage of about 0.5 V with a ～1-mA current margin of the 1 st quantum voltage step is obtained.To further prove the quality of NIM device, a comparison between the NIM device with the National Institute of Standards and Technology(NIST) programmable Josephson voltage standard(PJVS) system device is conducted. The difference of the reproduced 0.5-V quantum voltage between the two devices is about 0.55 nV, which indicates good agreement between the two devices. With the homemade device, we have realized a precise and applicable 0.5-V applicable-level quantum voltage.

引文

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