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Enhancement of Rydberg atom interactions using ac Stark shifts

P. Bohlouli-Zanjani·J. A. Petrus·J. D. D. Martin
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Abstract

The ac Stark effect was used to induce resonant energy transfer between translationally cold Rydberg atoms. The Rb Rydberg atoms were obtained by laser excitation of cold atoms from a magneto-optical trap. Using two-photon microwave spectroscopy of the 49s_{1/2}-50s_{1/2} transition, the field strength of a 28.5 GHz dressing field was calibrated. When this dressing field was set at specific field strengths, the two-atom dipole-dipole process 43d_{5/2} + 43d_{5/2} -> 45p_{3/2} + 41f was dramatically enhanced, due to induced degeneracy of the initial and final states. A series of observed resonant field strengths correspond to different magnetic sublevel possibilities for the initial and final states. These agree well with calculated resonance fields based on a perturbative ac Stark shift formula. This method for enhancing interactions is complementary to dc electric-field-induced resonant energy transfer, but has more flexibility due to the possibility of varying the applied frequency.

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P. Bohlouli-Zanjani, J. A. Petrus, J. D. D. Martin. 2006-12-23. Enhancement of Rydberg atom interactions using ac Stark shifts. https://doi.org/10.1103/physrevlett.98.203005

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