中国物理B ›› 2012, Vol. 21 ›› Issue (9): 98501-098501.doi: 10.1088/1674-1056/21/9/098501

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

Tuning rf-SQUID flux qubit system's potential with magnetic flux bias

花涛, 许伟伟, 史建新, 安德越, 孙国柱, 于扬, 吴培亨   

  1. a Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China;
    b National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
  • 收稿日期:2012-04-06 修回日期:2012-05-17 出版日期:2012-08-01 发布日期:2012-08-01
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant Nos. 2011CBA00107 and 2011CBA00202) and the National Natural Science Foundation of China (Grant Nos. 61027008 and 11074114).

Tuning rf-SQUID flux qubit system's potential with magnetic flux bias

Hua Tao (花涛), Xu Wei-Wei (许伟伟), Shi Jian-Xin (史建新), An De-Yue (安德越), Sun Guo-Zhu (孙国柱), Yu Yang (于扬), Wu Pei-Heng (吴培亨)   

  1. a Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China;
    b National Laboratory of Solid State Microstructures, School of Physics, Nanjing University, Nanjing 210093, China
  • Received:2012-04-06 Revised:2012-05-17 Online:2012-08-01 Published:2012-08-01
  • Contact: Xu Wei-Wei E-mail:wwxu@nju.edu.cn
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant Nos. 2011CBA00107 and 2011CBA00202) and the National Natural Science Foundation of China (Grant Nos. 61027008 and 11074114).

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摘要： At an extremely low temperature of 20 mK, we measured loop current in a tunable rf superconducting quantum interference device (SQUID) with a dc-SQUID. By adjusting the magnetic flux applied to the rf-SQUID loop (Φf) and the small dc-SQUID (Φfcjj), respectively, the potential shape of the system can be fully controlled in situ. Variations of transition step and overlap size in switching current with the barrier flux bias are analyzed, from which we can obtain some relevant device parameters and built up a model to explain the experimental phenomenon.

关键词: rf-SQUID, potential, flux qubit

Abstract: At an extremely low temperature of 20 mK, we measured loop current in a tunable rf superconducting quantum interference device (SQUID) with a dc-SQUID. By adjusting the magnetic flux applied to the rf-SQUID loop (Φf) and the small dc-SQUID (Φfcjj), respectively, the potential shape of the system can be fully controlled in situ. Variations of transition step and overlap size in switching current with the barrier flux bias are analyzed, from which we can obtain some relevant device parameters and built up a model to explain the experimental phenomenon.

Key words: rf-SQUID, potential, flux qubit

中图分类号:  (Superconducting quantum interference devices (SQUIDs))

  • 85.25.Dq
85.25.Cp (Josephson devices) 03.67.Lx (Quantum computation architectures and implementations)