Fabrication and characterization of all-Nb lumped-element Josephson parametric amplifiers |
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| Institution: | 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 |
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| 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. |
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| Keywords: | Josephson parametric amplifier Nb/Al-AlOx/Nb Josephson junctions lumped-element resonator |
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