Broadband flux-pumped Josephson parametric amplifier with an on-chip coplanar waveguide impedance transformer

作者：Peng Duan, Zhi-Long Jia, Chi Zhang, Lei Du, Haoran Tao, Xinxin Yang, Liang-Liang Guo, Yong Chen, Haifeng Zhang, Zhihao Peng, Weicheng Kong, Hai-Ou Li, Gang Cao, Guo‐Ping Guo · 发表于：Applied Physics Express · 年份：2021 · DOI：10.35848/1882-0786/abf029 · 被引用次数：25 · 研究领域：Quantum Information and Cryptography、Quantum and electron transport phenomena、Neural Networks and Reservoir Computing

Abstract The rapid progress towards scalable quantum processors demands amplifiers with large bandwidths and high saturation powers. For this purpose, we present a broadband flux-pumped Josephson parametric amplifier integrated with an on-chip coplanar waveguide impedance transformer. Our device can be fabricated with simple and straightforward photo-lithography. This device experimentally achieves an operational bandwidth over 600 MHz with a gain above 15 dB, and a high saturation power with quantum-limited noise performance. In addition, the center frequency of this device can be tuned over several hundred megahertz, which in turn broadens the effective operational bandwidth to around 1 GHz.