中国物理B ›› 2019, Vol. 28 ›› Issue (6): 68501-068501.doi: 10.1088/1674-1056/28/6/068501

• INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇    下一篇

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

Lanruo Wang(王兰若), Jinjin Li(李劲劲), Wenhui Cao(曹文会), Yuan Zhong(钟源), Zhonghua Zhang(张钟华)   

  1. 1 Department of Electrical Engineering, Tsinghua University, Beijing 100089, China;
    2 National Institute of Metrology, Beijing 122000, China;
    3 Key Laboratory of the Electrical Quantum Standard of AQSIQ, Beijing 122000, China
  • 收稿日期:2018-11-22 修回日期:2019-03-27 出版日期:2019-06-05 发布日期:2019-06-05
  • 通讯作者: Jinjin Li E-mail:jinjinli@nim.ac.cn
  • 基金资助:

    Project supported by the National Key Research and Development Program of China (Grant No. 2016YFF02000402).

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

Lanruo Wang(王兰若)1, Jinjin Li(李劲劲)2,3, Wenhui Cao(曹文会)2,3, Yuan Zhong(钟源)2,3, Zhonghua Zhang(张钟华)2,3   

  1. 1 Department of Electrical Engineering, Tsinghua University, Beijing 100089, China;
    2 National Institute of Metrology, Beijing 122000, China;
    3 Key Laboratory of the Electrical Quantum Standard of AQSIQ, Beijing 122000, China
  • Received:2018-11-22 Revised:2019-03-27 Online:2019-06-05 Published:2019-06-05
  • Contact: Jinjin Li E-mail:jinjinli@nim.ac.cn
  • Supported by:

    Project supported by the National Key Research and Development Program of China (Grant No. 2016YFF02000402).

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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/NbxSi1-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 1st 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.

关键词: Josephson voltage standards, Josephson junction, superconducting-normal metal-superconducting (SNS) junction, quantum device

Abstract:

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/NbxSi1-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 1st 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.

Key words: Josephson voltage standards, Josephson junction, superconducting-normal metal-superconducting (SNS) junction, quantum device

中图分类号:  (Josephson devices)

  • 85.25.Cp
74.81.Fa (Josephson junction arrays and wire networks) 06.20.fa (Units) 84.37.+q (Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.))