Reducing Rydberg polarizability by microwave dressing

We have demonstrated reduction of Rydberg state DC polarizability of Cesium atoms in a 77 K environment utilizing microwave field dressing. In particular we aim to reduce the polarizability of  52P_3/2  states which have relevant resonances at 5.4 GHz to 51D_5/2, compatible with interfacing Rydberg atoms to superconducting resonators in a cryogenic environment. We measure the polarizability of the Rydberg states using magneto optical trap (MOT) loss spectroscopy. Using an off-resonant RF field coupling these two levels we have demonstrated a reduction in DC polarizability of the 52P_3/2 of over 80%.  Our experimental findings are in agreement with a numerical model of the system developed using the Shirley-Floquet formalism. We also demonstrate that the DC polarizability reduction is highly anisotropic, with near total nulling possible when the DC and dressing fields are aligned. We hope to use these results to stabilize Rydberg resonances against varying DC fields present near surfaces, enabling advancements in the development of hybrid Rydberg atom - superconducting resonator quantum gates.