Enhanced measurement precision with continuous interrogation during dynamical decoupling

• URL: http://arxiv.org/abs/2212.04829v2
• Date: Thu, 1 Jun 2023 16:00:25 GMT
• Title: Enhanced measurement precision with continuous interrogation during dynamical decoupling
• Authors: Jun Zhang, Peng Du, Lei Jing, Peng Xu, Li You, Wenxian Zhang
• Abstract summary: Dynamical decoupling (DD) is normally ineffective when applied to DC measurement. This work proposes a phase relay method (PRM) that is capable of continuously interrogating the DC signal over many DD cycles.
• Score: 13.788000566644195
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• 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 (PRM) that is capable of continuously interrogating the DC signal over many DD cycles. We illustrate its efficacy when applied to measurement of a weak DC magnetic field with an atomic spinor Bose-Einstein condensate. Sensitivities approaching standard quantum limit (SQL) or Heisenberg limit (HL) are potentially realizable for a coherent spin state (CSS) or a squeezed spin state (SSS) of 10,000 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 will like find other applications for resorting coherence in quantum sensing and quantum information processing research.

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