Enhanced measurement precision with continuous interrogation during dynamical decoupling

doi:10.1088/1674-1056/ad1985

中国物理B ›› 2024, Vol. 33 ›› Issue (3): 30301-030301.doi: 10.1088/1674-1056/ad1985

Enhanced measurement precision with continuous interrogation during dynamical decoupling

Jun Zhang(张军)¹, Peng Du(杜鹏)¹, Lei Jing(敬雷)¹, Peng Xu(徐鹏)¹, Li You(尤力)², and Wenxian Zhang(张文献)^1,3,†

1 Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, and School of Physics and Technology, Wuhan University, Wuhan 430072, China;
2 State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China;
3 Wuhan Institute of Quantum Technology, Wuhan 430206, China

收稿日期:2023-10-05 修回日期:2023-12-11 接受日期:2023-12-29 出版日期:2024-02-22 发布日期:2024-02-22
通讯作者: Wenxian Zhang E-mail:wxzhang@whu.edu.cn
基金资助:
Project supported by the NSAF (Grant No. U1930201), the National Natural Science Foundation of China (Grant Nos. 12274331, 91836101, and 91836302), the National Key R&D Program of China (Grant No. 2018YFA0306504), and Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302100).

Enhanced measurement precision with continuous interrogation during dynamical decoupling

Jun Zhang(张军)¹, Peng Du(杜鹏)¹, Lei Jing(敬雷)¹, Peng Xu(徐鹏)¹, Li You(尤力)², and Wenxian Zhang(张文献)^1,3,†

1 Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, and School of Physics and Technology, Wuhan University, Wuhan 430072, China;
2 State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, China;
3 Wuhan Institute of Quantum Technology, Wuhan 430206, China

Received:2023-10-05 Revised:2023-12-11 Accepted:2023-12-29 Online:2024-02-22 Published:2024-02-22
Contact: Wenxian Zhang E-mail:wxzhang@whu.edu.cn
Supported by:
Project supported by the NSAF (Grant No. U1930201), the National Natural Science Foundation of China (Grant Nos. 12274331, 91836101, and 91836302), the National Key R&D Program of China (Grant No. 2018YFA0306504), and Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302100).

摘要/Abstract

摘要： Dynamical decoupling (DD) is normally ineffective when applied to DC measurement. In its straightforward implementation, DD nulls out DC signal as well while suppressing noise. This work proposes a phase relay method that is capable of continuously interrogating the DC signal over many DD cycles. We illustrate its efficacy when applied to the measurement of a weak DC magnetic field with an atomic spinor Bose-Einstein condensate. Sensitivities approaching standard quantum limit or Heisenberg limit are potentially realizable for a coherent spin state or a squeezed spin state of 10000 atoms, respectively, while ambient laboratory level noise is suppressed by DD. Our work offers a practical approach to mitigate the limitations of DD to DC measurement and would find other applications for resorting coherence in quantum sensing and quantum information processing research.

关键词: quantum sensing, continuous interrogation, quantum magnetometer, dynamical decoupling, Heisenberg limit

Abstract: Dynamical decoupling (DD) is normally ineffective when applied to DC measurement. In its straightforward implementation, DD nulls out DC signal as well while suppressing noise. This work proposes a phase relay method that is capable of continuously interrogating the DC signal over many DD cycles. We illustrate its efficacy when applied to the measurement of a weak DC magnetic field with an atomic spinor Bose-Einstein condensate. Sensitivities approaching standard quantum limit or Heisenberg limit are potentially realizable for a coherent spin state or a squeezed spin state of 10000 atoms, respectively, while ambient laboratory level noise is suppressed by DD. Our work offers a practical approach to mitigate the limitations of DD to DC measurement and would find other applications for resorting coherence in quantum sensing and quantum information processing research.

Key words: quantum sensing, continuous interrogation, quantum magnetometer, dynamical decoupling, Heisenberg limit

中图分类号: (Decoherence; open systems; quantum statistical methods)

03.65.Yz

03.67.Bg (Entanglement production and manipulation) 67.85.-d (Ultracold gases, trapped gases)

Jun Zhang(张军), Peng Du(杜鹏), Lei Jing(敬雷), Peng Xu(徐鹏), Li You(尤力), and Wenxian Zhang(张文献). Enhanced measurement precision with continuous interrogation during dynamical decoupling[J]. 中国物理B, 2024, 33(3): 30301-030301.

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Enhanced measurement precision with continuous interrogation during dynamical decoupling

Enhanced measurement precision with continuous interrogation during dynamical decoupling

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