Enhanced microwave electrometry in weakly interacting Rydberg atoms using a modified formula.

Area of Science:

• Atomic Physics
• Quantum Optics
• Spectroscopy

Background:

• Nonlocal van der Waals (vdW) and dipole-dipole (DD) interactions limit precision in microwave electrometry using cold Rydberg atoms.
• High excitation densities in four-level cascade configurations exacerbate these limitations.

Purpose of the Study:

• To investigate the impact of vdW and DD interactions on microwave-controlled transmission spectra in Rydberg atoms.
• To develop a modified formula for accurate nonlinear relationship description between microwave electric fields and electromagnetically induced transparency (EIT) peak splitting.
• To mitigate restrictions imposed by vdW and DD interactions and enhance measurement accuracy.

Main Methods:

• Utilized the mean-field superatom model to analyze vdW and DD interaction effects.
• Examined microwave-controlled transmission spectra in the electromagnetically induced transparency (EIT) regime.
• Proposed and validated a modified formula for microwave electric field and EIT peak splitting nonlinearities.

Main Results:

• Identified spectral shifts caused by vdW and DD interactions.
• Developed a formula that accurately describes the nonlinear relationship, enhancing measurement accuracy.
• Extended the lower measurement limit into the nonlinear response region by approximately five times.
• Demonstrated effective mitigation of vdW and DD interaction restrictions.

Conclusions:

• Accurate measurement of weak microwave electric fields is achievable in both high and low-density atomic gases through data correction.
• The proposed method offers an alternative solution for microwave electrometry in weakly interacting atomic gases.
• Findings suggest potential applications in integrated quantum devices.