Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 20: Precision spectroscopy of atoms and ions III
A 20.1: Hauptvortrag
Mittwoch, 11. März 2020, 14:00–14:30, f303
Coherent laser spectroscopy of highly charged ions using quantum logic — •Peter Micke1,2, Tobias Leopold1, Steven A. King1, Erik Benkler1, Lukas J. Spieß1, Lisa Schmöger1,2, Maria Schwarz1,2, José R. Crespo López-Urrutia2, and Piet O. Schmidt1,3 — 1Physikalisch-Technische Bundesanstalt, Braunschweig — 2Max-Planck-Institut für Kernphysik, Heidelberg — 3Institut für Quantenoptik, Leibniz Universität Hannover
Highly charged ions (HCI) are an extreme form of matter with favorable properties for novel high-accuracy atomic clocks and sensitive tests for physics beyond the Standard Model. We demonstrate the first coherent laser spectroscopy of HCI and improve the precision of the previous state-of-the-art spectroscopy by many orders of magnitude, thus unlocking the potential of HCI for applications in frequency metrology and the search for a time variation of fundamental constants [1].
We isolate a single Ar13+ HCI, produced in a hot plasma at a million kelvins, and confine it together with one Be+ ion in a Paul trap. This two-ion crystal is then cooled to its quantum-mechanical ground state of motion. Using an ultra-stable clock laser and the quantum logic technique, we resolve the electric-dipole forbidden fine-structure transition of Ar13+ at 441 nm with a fractional frequency uncertainty of 3×10−15. Furthermore we measure the lifetime and g-factor of the excited state. The latter one resolves a discrepancy between previous theoretical predictions.
[1] P. Micke, T. Leopold, S. A. King et al., Nature (accepted).