{"id":"doi:10.1038/s41534-021-00510-2","kind":"article","title":"Towards practical quantum computers: transmon qubit with a lifetime approaching 0.5 milliseconds","authors":["Chenlu Wang","Xuegang Li","Huikai Xu","Zhiyuan Li","Junhua Wang","Zhen Yang","Zhenyu Mi","Xuehui Liang","Tang Su","Chuhong Yang","Guangyue Wang","Wenyan Wang","Yongchao Li","Mo Chen","Cheng-Yao Li","Kehuan Linghu","Jiaxiu Han","Yingshan Zhang","Yulong Feng","Yu Hao Song","Teng Ma","Jing-Ning Zhang","Ruixia Wang","Peng Zhao","Weiyang Liu"],"author_count":28,"year":2022,"published":"2022-01-13","venue":"npj Quantum Information","cited_by":374,"doi":"10.1038/s41534-021-00510-2","arxiv_id":null,"nct_id":null,"source_url":"https://doi.org/10.1038/s41534-021-00510-2","archive_url":"https://space-kitty.com/papers/doi:10.1038/s41534-021-00510-2","updated":null,"pmid":null,"pmcid":null,"openalex_id":"W4206124997","pdf_url":"https://www.nature.com/articles/s41534-021-00510-2.pdf","abstract":"Abstract 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 T1 lifetime of 503 μs. As a comparison, we also fabricated transmon qubits with other popular materials, including niobium and aluminum, under the same design and fabrication processes. After characterizing their coherence properties, we found that qubits prepared with tantalum films have the best performance. Since the dry etching process is stable and highly anisotropic, it is much more suitable for fabricating complex scalable quantum circuits, when compared to wet etching. As a result, the current breakthrough indicates that the dry etching process of tantalum film is a promising approach to fabricate medium- or large-scale superconducting quantum circuits with a much longer lifetime, meeting the requirements for building practical quantum computers.","abstract_license":"CC-BY (publisher license, via OpenAlex)","license":"cc-by","is_open_access":true,"retracted":false,"peer_reviewed":null,"categories":["Quantum Information and Cryptography"],"details":null,"provenance":"openalex","attribution":"Abstract of \"Towards practical quantum computers: transmon qubit with a lifetime approaching 0.5 milliseconds\" by Chenlu Wang, Xuegang Li, Huikai Xu et al., https://doi.org/10.1038/s41534-021-00510-2, used under its Creative Commons Attribution license (CC-BY); markup removed, otherwise unmodified.","topics":[{"slug":"superconducting-qubits","name":"Superconducting Quantum Processors","domain_slug":"quantum-computing"}],"cited_in_dossiers":[]}