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<p>It has been demonstrated that the Rydberg criticality in a many-body atomic system can enhance the measurement sensitivity of the microwave electric field by increasing the Fisher information. In our previous work, we proposed and experimentally verified that the Fisher information near the critical point can be increased by more than two orders of magnitude with the Rydberg atoms coupled with an optical cavity compared with that in free space. Here we demonstrate the precision measurement of the microwave electric field by cavity-enhanced critical behavior. We show that the equivalent measurement sensitivity of the microwave electric field can be enhanced by an order of magnitude compared with that in free space. The obtained sensitivity can be enhanced to 2.6 nV cm<sup>−1</sup> Hz<sup>−1/2</sup>.</p>

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High-precision measurement of microwave electric field by cavity-enhanced critical behavior in a many-body Rydberg atomic system

  • 期刊论文

  • 发表日期：

    2025年3月14日

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  • Qinxia Wang,
  • Yukang Liang,
  • Zhihui Wang,
  • Shijun Guan,
  • Pengfei Yang,
  • Pengfei Zhang,
  • Gang Li,
  • Tiancai Zhang

摘要

It has been demonstrated that the Rydberg criticality in a many-body atomic system can enhance the measurement sensitivity of the microwave electric field by increasing the Fisher information. In our previous work, we proposed and experimentally verified that the Fisher information near the critical point can be increased by more than two orders of magnitude with the Rydberg atoms coupled with an optical cavity compared with that in free space. Here we demonstrate the precision measurement of the microwave electric field by cavity-enhanced critical behavior. We show that the equivalent measurement sensitivity of the microwave electric field can be enhanced by an order of magnitude compared with that in free space. The obtained sensitivity can be enhanced to 2.6 nV cm−1 Hz−1/2.