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Chin. Phys. B, 2021, Vol. 30(6): 068503    DOI: 10.1088/1674-1056/abeee6
Special Issue: SPECIAL TOPIC — Quantum computation and quantum simulation
SPECIAL TOPIC—Quantum computation and quantum simulation Prev   Next  

Fabrication and characterization of all-Nb lumped-element Josephson parametric amplifiers

Hang Xue(薛航)1,2,3, Zhirong Lin(林志荣)1,2,3,†, Wenbing Jiang(江文兵)1,3, Zhengqi Niu(牛铮琦)1,2,3,4, Kuang Liu(刘匡)1,2,3, Wei Peng(彭炜)1,2,3, and Zhen Wang(王镇)1,2,3,4
1 State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology(SIMIT), Chinese Academy of Sciences, Shanghai 200050, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 CAS Center for Excellence in Superconducting Electronics(CENSE), Shanghai 200050, China;
4 ShanghaiTech University, Shanghai 201210, China
Abstract  Josephson parametric amplifiers (JPAs) with nearly quantum-limited noise performance have become indispensable devices for the measurements of superconducting quantum information. We have developed an all-Nb lumped-element flux-driven JPA operating in the three-wave mixing mode. Our Nb-based JPA comprises Nb/Al-AlOx/Nb Josephson junctions, a parallel-plate capacitor with SiO2 dielectric sandwiched between two Nb layers, a bottom coplanar waveguides layer, and a top Nb wiring layer. We experimentally demonstrate a 20 dB gain over a 190 MHz bandwidth, a mean 1 dB compression of -123 dBm, and near quantum-limited noise performance. This fabrication process can be further used to design impedance transformed parametric amplifiers for multiple-qubit readout.
Keywords:  Josephson parametric amplifier      Nb/Al-AlOx/Nb Josephson junctions      lumped-element resonator  
Received:  13 January 2021      Revised:  25 February 2021      Accepted manuscript online:  16 March 2021
PACS:  85.25.Cp (Josephson devices)  
  85.25.Am (Superconducting device characterization, design, and modeling)  
  85.25.Dq (Superconducting quantum interference devices (SQUIDs))  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 92065116), Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDA18000000), and the Key-Area Research and Development Program of Guangdong Province, China (Grant No. 2020B0303030002).
Corresponding Authors:  Zhirong Lin     E-mail:

Cite this article: 

Hang Xue(薛航), Zhirong Lin(林志荣), Wenbing Jiang(江文兵), Zhengqi Niu(牛铮琦), Kuang Liu(刘匡), Wei Peng(彭炜), and Zhen Wang(王镇) Fabrication and characterization of all-Nb lumped-element Josephson parametric amplifiers 2021 Chin. Phys. B 30 068503

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