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We propose a method for reducing the sensitivity of atomic ground to Rydbergtransitions to stray dc electric fields, using microwave-induced dressing ofRydberg states. Calculations are presented for the Cs $\state{90S}{1/2}$ and$\state{90P}{3/2}$ states. With zero dc bias electric field, a two-frequency acfield is used to simultaneously reduce the sensitivity of both states to dcfield variations. The sensitivity reduction is a factor of 95 for the$\state{90S}{1/2}$ state and a factor of 1600 for the $\state{90P}{3/2},m_J=3/2$ state.  We also show how the two-frequency ac field can be used to cancel bothsecond- and fourth-order terms in the polarizability of a single Rydberg state.These results are relevant to improving the stability of experiments that seekto excite Rydberg atoms in the proximity of charged surfaces.

Reducing the sensitivity of Rydberg atoms to dc electric fields using two-frequency ac field dressing