Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 15: Precision spectroscopy of atoms and ions II
A 15.3: Talk
Wednesday, March 11, 2020, 11:45–12:00, f107
A robust clock transition on 40Ca+ with a continuous dynamical decoupling scheme — •Kai Dietze1,2, Lennart Pelzer1,2, Nati Aharon3, Ludwig Krinner1,2, Nicolas Spethmann1, Alex Retzker3, and Piet Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig,D — 2Leibniz-Universtität-Hannover,30167 Hannover,D — 3The Hebrew University of Jerusalem, 91904 Jerusalem, IL
The statistical uncertainty of optical atomic clocks based on single trapped ions is limited by long averaging times. Referencing the clock laser simultaneously on large ensembles of ions can improve the laser frequency noise and thus allow longer probe times. However, trapping a larger number of ions introduces several systematic frequency shifts, resulting in inhomogeneous broadening of the clock transition. In our experiment, we couple the clock transition between the 4 S1/2 and 5 D5/2 Zeeman-substates of 40Ca+ with radiofrequency fields, to engineer dressed states with significantly reduced systematic shifts. The scheme is based on up to four driving fields to suppress the linear Zeeman-, quadrupole-, and tensor ac-Stark shifts by orders of magnitude [1]. We present predictions on the performance of these strongly coupled systems as a reference transition for laser stabilization and experimental results implementing this scheme in our segmented Paul-trap as a multi-ion approach.
[1] Aharon et al., New Journal of Physics 21 (2019) 083040.