Broadband Josephson parametric amplifier using lumped-element transmission line impedance matching architecture
Yapeng Lu, Wenqu Xu, Quan Zuo, Jiazheng Pan, Xingyu Wei, Junliang Jiang, Zishuo Li, Kaixuan Zhang, Tingting Guo, Shuo Wang, Chunhai Cao, Huabing Wang, Weiwei Xu, Guozhu Sun, Peiheng Wu
Abstract
We present a fishbone-like lumped-element artificial transmission line to overcome impedance mismatch in a reflection-type Josephson parametric amplifier between a nonlinear resonator and an external transmission line. Using this easily prepared architecture, we design and fabricate a broadband Josephson parametric amplifier, which has gain in an excess of 20 dB with a bandwidth of hundreds of MHz. Furthermore, by varying the working point of the device, the operating frequency of amplification can be tuned in a wide frequency range of 1 GHz while the amplifier operates in the mode of either three-wave mixing or four-wave mixing. Such a parametric amplifier is suitable for engineering applications of superconducting circuit quantum electrodynamics.