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Chin. Phys. B, 2021, Vol. 30(6): 068504    DOI: 10.1088/1674-1056/ac0420
Special Issue: SPECIAL TOPIC — Quantum computation and quantum simulation
SPECIAL TOPIC—Quantum computation and quantum simulation Prev   Next  

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 Research Institute of Superconductor Electronics, School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China;
2 Purple Mountain Laboratories, Nanjing 211111, China
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.
Keywords:  Josephson junction      parametric amplification      impedance matching      gain and bandwidth  
Received:  04 January 2021      Revised:  30 March 2021      Accepted manuscript online:  09 April 2021
PACS:  85.25.Cp (Josephson devices)  
  52.35.Mw (Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))  
Fund: 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.
Corresponding Authors:  Wei-Wei Xu, Wei-Wei Xu     E-mail:  wwxu@nju.edu.cn;gzsun@nju.edu.cn

Cite this article: 

Ya-Peng Lu(卢亚鹏), Quan Zuo(左权), Jia-Zheng Pan(潘佳政), Jun-Liang Jiang(江俊良), Xing-Yu Wei(魏兴雨), Zi-Shuo Li(李子硕), Wen-Qu Xu(许问渠), Kai-Xuan Zhang(张凯旋), Ting-Ting Guo(郭婷婷), Shuo Wang(王硕), Chun-Hai Cao(曹春海), Wei-Wei Xu(许伟伟), Guo-Zhu Sun(孙国柱), and Pei-Heng Wu(吴培亨) An easily-prepared impedance matched Josephson parametric amplifier 2021 Chin. Phys. B 30 068504

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