Abstract
Dynamical decoupling(DD)is normally ineffective when applied to DC measurement.In its straightforward im-plementation,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.
基金项目
国家自然科学基金(U1930201)
国家自然科学基金(12274331)
国家自然科学基金(91836101)
国家自然科学基金(91836302)
国家重点研发计划(2018YFA0306504)
Innovation Program for Quantum Science and Technology(2021ZD0302100)
维普
万方数据