Fabrication and characterization of ultra-low noise narrow and wide band Josephson parametric amplifiers

Huang Keqiang^{1, 3}, Guo Qiujiang², Song Chao², Zheng Yarui¹, Deng Hui¹, Wu Yulin^{1, 4}, Jin Yirong¹, Zhu Xiaobo^{1, 4, †}, Zheng Dongning^{1, 3, ‡}

(color online) (a) The response of S₂₁ of the quantum chip with Josephson parameter amplifier pump on and off. (b) Josephson parameter amplifier gain-bandwidth plot, the bandwidth with gain more than 14 dB is about 35 MHz.