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

• 作者: Hang Xue Zhirong Lin Wenbing Jiang Zhengqi Niu Kuang Liu Wei Peng Zhen Wang
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: SPECIAL TOPIC—Quantum computation and quantum simulation
• 页码范围: 47-52
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/abeee6

摘要

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.