Industry-compatible silicon spin-qubit unit cells exceeding 99% fidelity

• 成果类型: Article
• 署名作者: Steinacker, Paul; Dumoulin Stuyck, Nard; Lim, Wee Han; Tanttu, Tuomo; Feng, Mengke; Serrano, Santiago; Nickl, Andreas; Candido, Marco; Cifuentes, Jesus D.; Vahapoglu, Ensar; Bartee, Samuel K.; Hudson, Fay E.; Chan, Kok Wai; Kubicek, Stefan; Jussot, Julien; Canvel, Yann; Beyne, Sofie; Shimura, Yosuke; Loo, Roger; Godfrin, Clement; Raes, Bart; Baudot, Sylvain; Wan, Danny; Laucht, Arne; Yang, Chih Hwan; Saraiva, Andre; Escott, Christopher C.; De Greve, Kristiaan; Dzurak, Andrew S.
• 署名单位: University of New South Wales Sydney; Interuniversity Microelectronics Centre; Ghent University; KU Leuven
• 刊物名称: NATURE
• ISSN/ISSBN: 0028-0836; 1476-4687
• DOI: 10.1038/s41586-025-09531-9
• 发表日期: 2025-10-02
• 关键词: quantum information; gate; logic; noise

摘要

Among the many types of qubit presently being investigated for a future quantum computer, silicon spin qubits with millions of qubits on a single chip are uniquely positioned to enable quantum computing. However, it has not been clear whether the outstanding high-fidelity operations and long coherence times shown by silicon spin qubits fabricated in academic settings1, 2, 3, 4, 5, 6, 7-8 can be reliably reproduced when the qubits are manufactured in a semiconductor foundry9, 10-11. Here we show precise qubit operation of silicon two-qubit devices made with standard semiconductor tooling in a 300-mm foundry environment. Of the key metrics, single- and two-qubit control fidelities exceed 99% for all four devices, and the state preparation and measurement fidelities reach up to 99.9%, as evidenced by gate set tomography. We report spin lifetime and coherence up to T1 = 9.5 s, T2*=40.6 mu s\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${T}_{2}<^>{* }=40.6\,{\rm{\mu }}{\rm{s}}$$\end{document} and T2Hahn=1.9ms\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${T}_{2}<^>{{\rm{Hahn}}}=1.9\,{\rm{ms}}$$\end{document}. We determine that residual nuclear spin-carrying isotopes contribute substantially to operational errors, identifying further isotopic purification as a clear pathway to even higher performance.