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.
作者
张军
杜鹏
敬雷
徐鹏
尤力
张文献
Jun Zhang;Peng Du;Lei Jing;Peng Xu;Li You;Wenxian Zhang(Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education,and School of Physics and Technology,Wuhan University,Wuhan 430072,China;State Key Laboratory of Low-Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084,China;Wuhan Institute of Quantum Technology,Wuhan 430206,China)
基金
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)
Innovation Program for Quantum Science and Technology(Grant No.2021ZD0302100).
