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G. Kazakov, Thorsten Schumm:
""Second-order magic" radio-frequency dressing for magnetically trapped 87Rb atoms";
Talk: DPG-Frühjahrstagung Heidelberg 2015, Heidelberg (invited); 2015-03-23 - 2015-03-27.

We propose 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 atoms potential energy to first order. Still, higher order effects are a dominating source for dephasing,
limiting the perfomance 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 corresponding values of dressing frequencies, amplitudes, and trapping fields for 87Rb atoms, and investigate quantitatively the robustness of these тsecond-order magicт conditions to variations of the trapping field and dressing field amplitude and polarization. We conclude that such radio-frequency dressing can suppress field-induced dephasing by at least one order of magnitude in comparison with "ordinary" magic trap without dressing.

Cold atoms, microwave standard, trapping

http://publik.tuwien.ac.at/files/PubDat_245716.pdf