Magic radio-frequency dressing for trapped atomic microwave clocks

Author(s): G.A. Kazakov, Thorsten Schumm

Journal: Phys. Rev. A

Volume: 91

Page(s): 023404

Year: 2015

DOI Number: DOI: 10.1103/PhysRevA.91.023404

Link: Link to publication


It has been proposed to use magnetically trapped atomic ensembles to enhance the interrogation time in microwave clocks. To mitigate the perturbing effects of the magnetic trap, near-magic-field configurations are

employed, where the involved clock transition becomes independent of the atom’s potential energy to first order. Still, higher order effects are a dominating source for dephasing, limiting the performance of this approach.

Here we propose a simple method to cancel the energy dependence to both first and second order, using weak radio-frequency dressing. We give values for dressing frequencies, amplitudes, and trapping fields for 87 Rb atoms and investigate quantitatively the robustness of these second-order-magic conditions to variations of the system parameters. We conclude that radio-frequency dressing can suppress field-induced dephasing by at least one order of magnitude for typical experimental parameters.

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