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) The phase component of S₂₁ versus dc flux bias and signal frequency of our wide-band JPA sample.