Coherent manipulation of a tunable hybrid qubit via microwave control

doi:10.1088/1674-1056/acd0a7

中国物理B ›› 2023, Vol. 32 ›› Issue (8): 87302-087302.doi: 10.1088/1674-1056/acd0a7

Coherent manipulation of a tunable hybrid qubit via microwave control

Si-Si Gu(顾思思)^1,2, Bao-Chuan Wang(王保传)^1,2, Hai-Ou Li(李海欧)^1,2, Gang Cao(曹刚)^1,2,†, and Guo-Ping Guo(郭国平)^1,2,3

1. CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China;
2. CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
3. Origin Quantum Computing Company Limited, Hefei 230026, China

收稿日期:2023-03-23 修回日期:2023-04-25 出版日期:2023-07-14 发布日期:2023-07-24
通讯作者: Gang Cao E-mail:gcao@ustc.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos.92265113, 12074368, and 12034018) and the USTC Tang Scholarship.

Coherent manipulation of a tunable hybrid qubit via microwave control

Si-Si Gu(顾思思)^1,2, Bao-Chuan Wang(王保传)^1,2, Hai-Ou Li(李海欧)^1,2, Gang Cao(曹刚)^1,2,†, and Guo-Ping Guo(郭国平)^1,2,3

1. CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei 230026, China;
2. CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei 230026, China;
3. Origin Quantum Computing Company Limited, Hefei 230026, China

Received:2023-03-23 Revised:2023-04-25 Online:2023-07-14 Published:2023-07-24
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos.92265113, 12074368, and 12034018) and the USTC Tang Scholarship.

摘要/Abstract

摘要： Hybrid qubits enable the hybridization of charge and spin degrees of freedom, which provides a way to realize both a relatively long coherence time and rapid qubit manipulation. Here, we use microwave driving to demonstrate the coherent operation of a tunable hybrid qubit, including X-rotation, Z-rotation, and rotation around an arbitrary axis in the X-Y panel of the Bloch sphere. Moreover, the coherence properties of the qubit and its tunability are studied. The measured coherence time of the X-rotation reaches ～ 14.3 ns. While for the Z-rotation, the maximum decoherence time is ～ 5.8 ns due to the larger sensitivity to noise. By employing the Hahn echo sequence to mitigate the influence of the low-frequency noise, we have improved the qubit coherence time from ～ 5.8 ns to ～ 15.0 ns. Our results contribute to a further understanding of the hybrid qubit and a step towards achieving high-fidelity qubit gates in the hybrid qubit.

关键词: semiconductor quantum dot, hybrid qubit, qubit operation, microwave control

Abstract: Hybrid qubits enable the hybridization of charge and spin degrees of freedom, which provides a way to realize both a relatively long coherence time and rapid qubit manipulation. Here, we use microwave driving to demonstrate the coherent operation of a tunable hybrid qubit, including X-rotation, Z-rotation, and rotation around an arbitrary axis in the X-Y panel of the Bloch sphere. Moreover, the coherence properties of the qubit and its tunability are studied. The measured coherence time of the X-rotation reaches ～ 14.3 ns. While for the Z-rotation, the maximum decoherence time is ～ 5.8 ns due to the larger sensitivity to noise. By employing the Hahn echo sequence to mitigate the influence of the low-frequency noise, we have improved the qubit coherence time from ～ 5.8 ns to ～ 15.0 ns. Our results contribute to a further understanding of the hybrid qubit and a step towards achieving high-fidelity qubit gates in the hybrid qubit.

Key words: semiconductor quantum dot, hybrid qubit, qubit operation, microwave control

中图分类号: (Quantum dots)

73.21.La

85.35.Be (Quantum well devices (quantum dots, quantum wires, etc.)) 03.67.Lx (Quantum computation architectures and implementations) 42.50.Wk (Mechanical effects of light on material media, microstructures and particles)

Si-Si Gu(顾思思), Bao-Chuan Wang(王保传), Hai-Ou Li(李海欧), Gang Cao(曹刚), and Guo-Ping Guo(郭国平). Coherent manipulation of a tunable hybrid qubit via microwave control[J]. 中国物理B, 2023, 32(8): 87302-087302.

Si-Si Gu(顾思思), Bao-Chuan Wang(王保传), Hai-Ou Li(李海欧), Gang Cao(曹刚), and Guo-Ping Guo(郭国平). Coherent manipulation of a tunable hybrid qubit via microwave control[J]. Chin. Phys. B, 2023, 32(8): 87302-087302.

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Coherent manipulation of a tunable hybrid qubit via microwave control

Coherent manipulation of a tunable hybrid qubit via microwave control

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