中国物理B ›› 2021, Vol. 30 ›› Issue (6): 68504-068504.doi: 10.1088/1674-1056/ac0420

所属专题： SPECIAL TOPIC — Quantum computation and quantum simulation

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An easily-prepared impedance matched Josephson parametric amplifier

Ya-Peng Lu(卢亚鹏)1,2, Quan Zuo(左权)1,2, Jia-Zheng Pan(潘佳政)1,2, Jun-Liang Jiang(江俊良)1,2, Xing-Yu Wei(魏兴雨)1,2, Zi-Shuo Li(李子硕)1,2, Wen-Qu Xu(许问渠)1,2, Kai-Xuan Zhang(张凯旋)1,2, Ting-Ting Guo(郭婷婷)1,2, Shuo Wang(王硕)1,2, Chun-Hai Cao(曹春海)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
  • 收稿日期:2021-01-04 修回日期:2021-03-30 接受日期:2021-04-09 出版日期:2021-05-18 发布日期:2021-06-01
  • 通讯作者: Wei-Wei Xu, Wei-Wei Xu E-mail:wwxu@nju.edu.cn;gzsun@nju.edu.cn
  • 基金资助:
    Project partially supported by the National Key R&D Program of of China (Grant No. 2016YFA0301801), the National Natural Science Foundation of China (Grant Nos. 61521001 and 61571219), and PAPD, Dengfeng Project B of Nanjing University.

An easily-prepared impedance matched Josephson parametric amplifier

Ya-Peng Lu(卢亚鹏)1,2, Quan Zuo(左权)1,2, Jia-Zheng Pan(潘佳政)1,2, Jun-Liang Jiang(江俊良)1,2, Xing-Yu Wei(魏兴雨)1,2, Zi-Shuo Li(李子硕)1,2, Wen-Qu Xu(许问渠)1,2, Kai-Xuan Zhang(张凯旋)1,2, Ting-Ting Guo(郭婷婷)1,2, Shuo Wang(王硕)1,2, Chun-Hai Cao(曹春海)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:2021-01-04 Revised:2021-03-30 Accepted:2021-04-09 Online:2021-05-18 Published:2021-06-01
  • Contact: Wei-Wei Xu, Wei-Wei Xu E-mail:wwxu@nju.edu.cn;gzsun@nju.edu.cn
  • Supported by:
    Project partially supported by the National Key R&D Program of of China (Grant No. 2016YFA0301801), the National Natural Science Foundation of China (Grant Nos. 61521001 and 61571219), and PAPD, Dengfeng Project B of Nanjing University.

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摘要： An impedance matched parametric amplifier (IMPA) with Josephson junctions is fabricated and characterized. A hybrid structure containing coplanar and strip structures is implemented to realize an impedance taper line and a plate capacitor in an LC nonlinear resonator based on Josephson junctions. The upper plate of the capacitor is isolated with SiNx without grounding as well as the strips. Such easily-prepared designs greatly reduce the requirements for lithography alignment and precision, which makes the fabrication process more reliable. The experimental results show that in such IMPA a gain higher than 25 dB with a bandwidth of about 100 MHz can be obtained. This broadband amplifier operates close to the quantum limit. By adjusting the working point, a higher bandwidth of about 400 MHz can be obtained with a gain of about 17 dB.

关键词: Josephson junction, parametric amplification, impedance matching, gain and bandwidth

Abstract: An impedance matched parametric amplifier (IMPA) with Josephson junctions is fabricated and characterized. A hybrid structure containing coplanar and strip structures is implemented to realize an impedance taper line and a plate capacitor in an LC nonlinear resonator based on Josephson junctions. The upper plate of the capacitor is isolated with SiNx without grounding as well as the strips. Such easily-prepared designs greatly reduce the requirements for lithography alignment and precision, which makes the fabrication process more reliable. The experimental results show that in such IMPA a gain higher than 25 dB with a bandwidth of about 100 MHz can be obtained. This broadband amplifier operates close to the quantum limit. By adjusting the working point, a higher bandwidth of about 400 MHz can be obtained with a gain of about 17 dB.

Key words: Josephson junction, parametric amplification, impedance matching, gain and bandwidth

中图分类号:  (Josephson devices)

  • 85.25.Cp
52.35.Mw (Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))