中国物理B ›› 2018, Vol. 27 ›› Issue (6): 68501-068501.doi: 10.1088/1674-1056/27/6/068501

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

Characterization of barrier-tunable radio-frequency-SQUID for Maxwell's demon experiment

Gang Li(李刚), Suman Dhamala, Hao Li(李浩), Jian-She Liu(刘建设), Wei Chen(陈炜)   

  1. 1 Tsinghua National Laboratory for Information Science and Technology, Department of Microelectronics and Nanoelectronics, Institute of Microelectronics, Tsinghua University, Beijing 100084, China;
    2 Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045, USA
  • 收稿日期:2018-01-10 修回日期:2018-03-26 出版日期:2018-06-05 发布日期:2018-06-05
  • 通讯作者: Wei Chen E-mail:weichen@tsinghua.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No.11653001),the National Basic Research Program of China (Grant No.2011CBA00304),the Tsinghua University Initiative Scientific Research Program,China (Grant No.20131089314),and the Zhejiang Tianjingsheng Foundation,China,for Student Assistantships (Gang Li and Hao Li).

Characterization of barrier-tunable radio-frequency-SQUID for Maxwell's demon experiment

Gang Li(李刚)1, Suman Dhamala2, Hao Li(李浩)1, Jian-She Liu(刘建设)1, Wei Chen(陈炜)1   

  1. 1 Tsinghua National Laboratory for Information Science and Technology, Department of Microelectronics and Nanoelectronics, Institute of Microelectronics, Tsinghua University, Beijing 100084, China;
    2 Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045, USA
  • Received:2018-01-10 Revised:2018-03-26 Online:2018-06-05 Published:2018-06-05
  • Contact: Wei Chen E-mail:weichen@tsinghua.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No.11653001),the National Basic Research Program of China (Grant No.2011CBA00304),the Tsinghua University Initiative Scientific Research Program,China (Grant No.20131089314),and the Zhejiang Tianjingsheng Foundation,China,for Student Assistantships (Gang Li and Hao Li).

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摘要： We present the design, fabrication, and characterization of a barrier-tunable superconducting quantum interference device (SQUID) qubit for the study of Maxwell's demon experiment. In this work, a compound Josephson junction (CJJ) radio-frequency (RF)-SQUID qubit with an overdamped resistively shunted direct-current (DC)-SQUID magnetometer is used to continuously monitor the state of the qubit. The circuit is successfully fabricated with the standard Nb/Al-AlOx/Nb trilayer process of our laboratory and characterized in a low noise measurement system, which is capable of measuring coherent dynamics of superconducting qubits, in an Oxford dilution refrigerator. All circuit parameters are determined accurately by fitting experimental data to theoretical analysis and simulation, which allows us to make a quantitative comparison between the results of the experiment and theory.

关键词: barrier-tunable RF-SQUID, shunted DC-SQUID, Maxwell's demon

Abstract: We present the design, fabrication, and characterization of a barrier-tunable superconducting quantum interference device (SQUID) qubit for the study of Maxwell's demon experiment. In this work, a compound Josephson junction (CJJ) radio-frequency (RF)-SQUID qubit with an overdamped resistively shunted direct-current (DC)-SQUID magnetometer is used to continuously monitor the state of the qubit. The circuit is successfully fabricated with the standard Nb/Al-AlOx/Nb trilayer process of our laboratory and characterized in a low noise measurement system, which is capable of measuring coherent dynamics of superconducting qubits, in an Oxford dilution refrigerator. All circuit parameters are determined accurately by fitting experimental data to theoretical analysis and simulation, which allows us to make a quantitative comparison between the results of the experiment and theory.

Key words: barrier-tunable RF-SQUID, shunted DC-SQUID, Maxwell's demon

中图分类号:  (Josephson devices)

  • 85.25.Cp
85.25.Dq (Superconducting quantum interference devices (SQUIDs)) 07.20.Mc (Cryogenics; refrigerators, low-temperature detectors, and other low-temperature equipment)