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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 |
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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.
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Received: 05 October 2023
Revised: 11 December 2023
Accepted manuscript online: 29 December 2023
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PACS:
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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03.67.Bg
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(Entanglement production and manipulation)
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67.85.-d
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(Ultracold gases, trapped gases)
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| Fund: 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). |
Corresponding Authors:
Wenxian Zhang
E-mail: wxzhang@whu.edu.cn
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Cite this article:
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 2024 Chin. Phys. B 33 030301
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