Towards practical quantum computers: transmon qubit with a lifetime approaching 0.5 milliseconds

• Published in: npj quantum information Vol. 8; no. 1; pp. 1 - 6
• Main Authors: Wang, Chenlu, Li, Xuegang, Xu, Huikai, Li, Zhiyuan, Wang, Junhua, Yang, Zhen, Mi, Zhenyu, Liang, Xuehui, Su, Tang, Yang, Chuhong, Wang, Guangyue, Wang, Wenyan, Li, Yongchao, Chen, Mo, Li, Chengyao, Linghu, Kehuan, Han, Jiaxiu, Zhang, Yingshan, Feng, Yulong, Song, Yu, Ma, Teng, Zhang, Jingning, Wang, Ruixia, Zhao, Peng, Liu, Weiyang, Xue, Guangming, Jin, Yirong, Yu, Haifeng
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 13.01.2022; Nature Publishing Group; Nature Portfolio
• Subjects: 639/766/119/1003; 639/766/483/2802; 639/766/483/481; Aluminum; Classical and Quantum Gravitation; Computers; Etching; Physics; Physics and Astronomy; Quantum Computing; Quantum Field Theories; Quantum Information Technology; Quantum Physics; Relativity Theory; Spintronics; String Theory; Tantalum

Here we report a breakthrough in the fabrication of a long lifetime transmon qubit. We use tantalum films as the base superconductor. By using a dry etching process, we obtained transmon qubits with a best T 1 lifetime of 503 μs. As a comparison, we also fabricated transmon qubits with other popular...