Polarization dependencies in RF Electric field sensing with Rydberg atoms

With a high electrical polarizability and strong dipole moment, Rydberg atoms display sensitive responsiveness to subtle changes in the external field, making them highly suitable for quantifying the intensity of microwaves and related fields. Recent research in the domain of Rydberg atoms is actively contributing to the establishment of standards for electric fields in the microwave spectrum. this study specifically observe Autler-Townes splitting based on microwave amplitude using 5S1/2-5P3/2-51D5/2-50F7/2 transition of 85Rb Rydberg atom, simultaneously determining the RF electric field intensity by calculating the electric dipole moment according to the transition. we improve sensitivity via laser frequency stabilization using the ULE cavity, resulting in a notable increase to several tens of microvolts per centimeter per square root of hertz( V/cm√Hz). Furthermore, we confirmed changes in sensitivity according to changes in RF polarization, which allowed us to further increase sensitivity. these research results will be developed into research on the development of low-noise, high-sensitivity RF electric field quantum sensors.