Hannover 2020 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 24: Ultracold atoms, ions, and BEC V (joint session A/Q)
A 24.6: Vortrag
Donnerstag, 12. März 2020, 12:30–12:45, f303
Towards a high-accuracy Al+ optical clock — •Johannes Kramer1, Fabian Dawel1, Lennart Pelzer1, Ludwig Krinner1, Nicolas Spethmann1, and Piet O. Schmidt1, 2 — 1Physikalisch-Technische Bundesanstalt Braunschweig — 2Gottfried Wilhelm Leibniz Universität Hannover
We aim to build an optical atomic clock taking advantage of the 8 mHz narrow clock transition of a single 27Al+ ion stored inside a linear Paul trap together with a single 40Ca+ ion acting as logic ion. The low sensitivity of the aluminium ion’s 1S0 to 3P0 clock transition to external fields and its potential high Q-factor allow to reach accuracies on the level of 10−18. Frequency standards with such high accuracy are candidates for a future redefinition of the SI second as well as for cm-scale resolution in measuring the gravity field of the Earth due to the gravitational redshift. In this talk we present our experimental setup as well as latest results on measuring the clock transition of the ground-state cooled Al+-Ca+ crystal by quantum logic protocols.