Ultrafast coherent control of a hole spin qubit in a germanium quantum dot

Ke Wang; Gang Xu; Fei Gao; He Liu; Rong-Long Ma; Xin Zhang; Zhanning Wang; Gang Cao; Ting Wang; Jian-Jun Zhang; Dimitrie Culcer; Xuedong Hu; Hong-Wen Jiang; Hai-Ou Li; Guang-Can Guo; Guo-Ping Guo

doi:10.1038/s41467-021-27880-7

Ultrafast coherent control of a hole spin qubit in a germanium quantum dot

Nat Commun. 2022 Jan 11;13(1):206. doi: 10.1038/s41467-021-27880-7.

Authors

Ke Wang^#^{1

2}, Gang Xu^#^{1

2}, Fei Gao³, He Liu^{1

2}, Rong-Long Ma^{1

2}, Xin Zhang^{1

2}, Zhanning Wang⁴, Gang Cao^{1

2}, Ting Wang³, Jian-Jun Zhang⁵, Dimitrie Culcer⁴, Xuedong Hu⁶, Hong-Wen Jiang⁷, Hai-Ou Li^{8

9}, Guang-Can Guo^{1

2}, Guo-Ping Guo^{10

11

12}

Affiliations

¹ CAS Key Laboratory of Quantum Information, University of Science and Technology of China, 230026, Hefei, Anhui, China.
² CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, 230026, Hefei, Anhui, China.
³ Institute of Physics and CAS Center for Excellence in Topological Quantum Computation, Chinese Academy of Sciences, 100190, Beijing, China.
⁴ School of Physics, University of New South Wales, Sydney, 2052, Australia.
⁵ Institute of Physics and CAS Center for Excellence in Topological Quantum Computation, Chinese Academy of Sciences, 100190, Beijing, China. jjzhang@iphy.ac.cn.
⁶ Department of Physics, University at Buffalo, SUNY, Buffalo, NY, 14260, USA.
⁷ Department of Physics and Astronomy, University of California, Los Angeles, CA, 90095, USA.
⁸ CAS Key Laboratory of Quantum Information, University of Science and Technology of China, 230026, Hefei, Anhui, China. haiouli@ustc.edu.cn.
⁹ CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, 230026, Hefei, Anhui, China. haiouli@ustc.edu.cn.
¹⁰ CAS Key Laboratory of Quantum Information, University of Science and Technology of China, 230026, Hefei, Anhui, China. gpguo@ustc.edu.cn.
¹¹ CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, 230026, Hefei, Anhui, China. gpguo@ustc.edu.cn.
¹² Origin Quantum Computing Company Limited, 230026, Hefei, Anhui, China. gpguo@ustc.edu.cn.

^# Contributed equally.

Abstract

Operation speed and coherence time are two core measures for the viability of a qubit. Strong spin-orbit interaction (SOI) and relatively weak hyperfine interaction make holes in germanium (Ge) intriguing candidates for spin qubits with rapid, all-electrical coherent control. Here we report ultrafast single-spin manipulation in a hole-based double quantum dot in a germanium hut wire (GHW). Mediated by the strong SOI, a Rabi frequency exceeding 540 MHz is observed at a magnetic field of 100 mT, setting a record for ultrafast spin qubit control in semiconductor systems. We demonstrate that the strong SOI of heavy holes (HHs) in our GHW, characterized by a very short spin-orbit length of 1.5 nm, enables the rapid gate operations we accomplish. Our results demonstrate the potential of ultrafast coherent control of hole spin qubits to meet the requirement of DiVincenzo's criteria for a scalable quantum information processor.

Abstract

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