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

Abstract:

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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