题目/Title：
                        Vacuum-gap-based lumped element Josephson parametric amplifier

作者/Author：吴思诗, 张登科, 王锐, 刘玉龙, 王帅鹏, 刘其春, 蔡兆申, 李铁夫
                        Sishi Wu, Dengke Zhang, Rui Wang, Yulong Liu, Shuaipeng Wang, Qichun Liu, Zhaoshen Cai, Tiefu Li,

期刊/Journal：中国物理协会 Chinese Physics B

年份/Issue Date：2022.Jan.

卷（期）及页码/Volume（No.）&pages：Vol.31, No.1, pp.1-6

摘要/Abstract：

We propose a lumped element Josephson parametric amplifier with vacuum-gap-based capacitor. The capacitor is made of quasi-floating aluminum pad and on-chip ground. We take a fabrication process compatible with air-bridge technology, which makes our design adaptable for future on-chip integrated quantum computing system. Further engineering the input impedance, we obtain a gain above 20 d B over 162-MHz bandwidth, along with a quasi quantum-limit noise performance. This work should facilitate the development of quantum information processing and integrated superconducting circuit design.