中国物理B ›› 2020, Vol. 29 ›› Issue (12): 128401-.doi: 10.1088/1674-1056/abc2b8

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  • 收稿日期:2020-08-24 修回日期:2020-10-02 接受日期:2020-10-20 出版日期:2020-12-01 发布日期:2020-11-19

Compact NbN resonators with high kinetic inductance

Xing-Yu Wei(魏兴雨)1,2, Jia-Zheng Pan(潘佳政)1,2, Ya-Peng Lu(卢亚鹏)1,2, Jun-Liang Jiang(江俊良)1,2, Zi-Shuo Li(李子硕)1,2, Sheng Lu(卢盛)1,2, Xue-Cou Tu(涂学凑)1,2, Qing-Yuan Zhao(赵清源)1,2, Xiao-Qing Jia(贾小氢)1,2, Lin Kang(康琳)1,2, Jian Chen(陈健)1,2, Chun-Hai Cao(曹春海)1, Hua-Bing Wang(王华兵)1,2, Wei-Wei Xu(许伟伟)1, Guo-Zhu Sun(孙国柱)1,2,†, and Pei-Heng Wu(吴培亨)1,2   

  1. 1 Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China; 2 Purple Mountain Laboratories, Nanjing 211111, China
  • Received:2020-08-24 Revised:2020-10-02 Accepted:2020-10-20 Online:2020-12-01 Published:2020-11-19
  • Contact: Corresponding author. E-mail: gzsun@nju.edu.cn
  • Supported by:
    Project partially supported by the National Key R&D Program of China (Grant No. 2016YFA0301801), the National Natural Science Foundation of China (Grant Nos. 11474154 and 61521001), PAPD, Dengfeng Project B of Nanjing University, and the Fundamental Research Funds for the Central Universities, China (Grant No. 14380134).

Abstract: We design and fabricate Λ/2 coplanar waveguide NbN resonators, the thickness and length of which are only several nanometers and hundred microns, respectively. The quality factor of such compact resonators can reach up to 7.5×104 at single photon power level at 30 mK with the resonance frequency around 6.835 GHz. In order to tune the resonant frequency, the resonator is terminated to the ground with a dc-SQUID. By tuning the magnetic flux in the dc-SQUID, the effective inductance of the dc-SQUID is varied, which leads to the change in the resonant frequency of the resonator. The tunability range is more than 30 MHz and the quality factor is about 3×103. These compact and tunable NbN resonators have potential applications in the quantum information processing, such as in the precision measurement, coupling and/or reading out the quantum states of qubits.

Key words: superconducting resonator, NbN, kinetic inductance, tunable resonator

中图分类号:  (Microwave circuits)

  • 84.40.Dc
85.25.Dq (Superconducting quantum interference devices (SQUIDs))