# Theoretical Analysis of Enhanced Microwave Measurement Using Structured Beams

## TL;DR

This paper proposes a new method for measuring microwave electric fields using structured light beams in Rydberg atoms, offering higher precision and robustness.

## Contribution

The novelty lies in using a Bessel–Gauss beam to enhance measurement precision and robustness in microwave field detection.

## Key findings

- Using a Bessel–Gauss beam results in a narrower linewidth for probe transmission, improving measurement precision.
- The spectral linewidth can be further reduced by increasing the azimuthal index of the beam.
- The system achieves a 40-fold improvement in spectral resolution and is more robust compared to existing methods.

## Abstract

A theoretical scheme for precise measurement of microwave (MW) electric fields is proposed using a structured control field in Rydberg atoms. We use a Bessel–Gauss (BG) beam to drive the excited-state transition, its spatial structure characteristics result in a narrow linewidth of probe transmission, which benefits MW electric field measurement. It is interesting that the spectral linewidth could be further narrowed by increasing the azimuthal index. The minimum detectability of the MW field is about one-tenth of the common electromagnetically induced transparency scheme, and the spectrum resolution could be improved by about 40 times from simulation. Moreover, the system has good robustness.