Enhanced Microwave Electric Field Measurement With Cavity-Assisted Rydberg Electromagnetically Induced Transparency

We report a scheme for enhancing microwave electric field measurement by cavity-assisted Rydberg electromagnetically induced transparency in the Rb-87 coherent atomic system. The vacuum Rabi splitting appears when the probe field is strongly coupled with intracavity atoms. The cavity-assisted electromagnetically induced transparency with dual-peak profile is observed as a strong coupling laser is further introduced into the optical ring cavity. The optimal atomic density, resulting in an appropriate vacuum Rabi splitting interval and cavity-assisted electromagnetically induced transparency amplitude, is determined for the coupling effect criterion of the probe field and intracavity atoms. Finally, the cavity-assisted electromagnetically induced transparency is employed to accurately measure the microwave electric field strength, and a measurement sensitivity factor of about 2 is improved owing to an enhanced photon-atom interaction. This study is beneficial for the development of compact, broadband, and self-calibrating microwave receivers.

Automated summary

This study presents a scheme for enhancing microwave electric field measurement using cavity-assisted Rydberg electromagnetically induced transparency in the Rb-87 coherent atomic system. The results show that cavity-assisted electromagnetically induced transparency can accurately measure the microwave electric field strength, and the measurement sensitivity factor is improved by about 2.