High-fidelity quantum sensing of magnon excitations with a single electron spin in quantum dots

doi:10.1088/1674-1056/ac8919

中国物理B ›› 2022, Vol. 31 ›› Issue (12): 120302-120302.doi: 10.1088/1674-1056/ac8919

High-fidelity quantum sensing of magnon excitations with a single electron spin in quantum dots

Le-Tian Zhu(朱乐天)¹, Tao Tu(涂涛)^1,2,†, Ao-Lin Guo(郭奥林)¹, and Chuan-Feng Li(李传锋)^1,2,‡

1 Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230026, China;
2 Hefei National Laboratory, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230088, China

收稿日期:2022-06-06 修回日期:2022-08-05 接受日期:2022-08-12 出版日期:2022-11-11 发布日期:2022-11-11
通讯作者: Tao Tu, Chuan-Feng Li E-mail:tutao@ustc.edu.cn;cfli@ustc.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 11974336) and the National Key Research and Development Program of China (Grant No. 2017YFA0304100).

High-fidelity quantum sensing of magnon excitations with a single electron spin in quantum dots

Le-Tian Zhu(朱乐天)¹, Tao Tu(涂涛)^1,2,†, Ao-Lin Guo(郭奥林)¹, and Chuan-Feng Li(李传锋)^1,2,‡

1 Key Laboratory of Quantum Information, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230026, China;
2 Hefei National Laboratory, University of Science and Technology of China, Chinese Academy of Sciences, Hefei 230088, China

Received:2022-06-06 Revised:2022-08-05 Accepted:2022-08-12 Online:2022-11-11 Published:2022-11-11
Contact: Tao Tu, Chuan-Feng Li E-mail:tutao@ustc.edu.cn;cfli@ustc.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 11974336) and the National Key Research and Development Program of China (Grant No. 2017YFA0304100).

摘要/Abstract

摘要： Single-electron spins in quantum dots are the leading platform for qubits, while magnons in solids are one of the emerging candidates for quantum technologies. How to manipulate a composite system composed of both systems is an outstanding challenge. Here, we use spin-charge hybridization to effectively couple the single-electron spin state in quantum dots to the cavity and further to the magnons. Through this coupling, quantum dots can entangle and detect magnon states. The detection efficiency can reach 0.94 in a realistic experimental situation. We also demonstrate the electrical tunability of the scheme for various parameters. These results pave a practical pathway for applications of composite systems based on quantum dots and magnons.

关键词: quantum sensing, magnons excitations, spin qubits in quantum dots

Abstract: Single-electron spins in quantum dots are the leading platform for qubits, while magnons in solids are one of the emerging candidates for quantum technologies. How to manipulate a composite system composed of both systems is an outstanding challenge. Here, we use spin-charge hybridization to effectively couple the single-electron spin state in quantum dots to the cavity and further to the magnons. Through this coupling, quantum dots can entangle and detect magnon states. The detection efficiency can reach 0.94 in a realistic experimental situation. We also demonstrate the electrical tunability of the scheme for various parameters. These results pave a practical pathway for applications of composite systems based on quantum dots and magnons.

Key words: quantum sensing, magnons excitations, spin qubits in quantum dots

中图分类号: (Quantum computation architectures and implementations)

03.67.Lx

42.50.Dv (Quantum state engineering and measurements) 42.50.Pq (Cavity quantum electrodynamics; micromasers)

Le-Tian Zhu(朱乐天), Tao Tu(涂涛), Ao-Lin Guo(郭奥林), and Chuan-Feng Li(李传锋). High-fidelity quantum sensing of magnon excitations with a single electron spin in quantum dots[J]. 中国物理B, 2022, 31(12): 120302-120302.

Le-Tian Zhu(朱乐天), Tao Tu(涂涛), Ao-Lin Guo(郭奥林), and Chuan-Feng Li(李传锋). High-fidelity quantum sensing of magnon excitations with a single electron spin in quantum dots[J]. Chin. Phys. B, 2022, 31(12): 120302-120302.

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High-fidelity quantum sensing of magnon excitations with a single electron spin in quantum dots

High-fidelity quantum sensing of magnon excitations with a single electron spin in quantum dots

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