Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 36: Matter Wave Interferometry and Metrology I
Q 36.3: Vortrag
Mittwoch, 4. März 2026, 15:00–15:15, P 11
Frequency shifts of a transportable Al+ quantum logic optical clock — •Joost Hinrichs1,2, Constantin Nauk1,2, Gayatri Sasidharan1,2, M. Mazin Amir1,2, Alexander Bernet1,2, Pascal Engelhardt1,2, Sofia Herbers1, and Piet O. Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Leibniz University Hannover, 30167 Hannover, Germany
Optical atomic clocks are the most precise measurement tools, achieving fractional frequency uncertainties below 10−18. Transportable systems can exploit this accuracy in a broader range of applications. High-precision frequency ratio measurements on-site at various metrology institutes contribute to fulfill the requirements towards a redefinition of the SI second. Furthermore, transportable optical clocks can be used for relativistic geodesy as they allow height measurements on the cm level over large distances.
Our fully rack-integrated clock setup is based on the 1S0→3P0 transition in 27Al+. A co-trapped 40Ca+ ion allows for sympathetic cooling and state detection through quantum logic spectroscopy. We present the results of our investigation of various frequency shifts in our optical clock, with a focus on effects related to the linear segmented multilayer Paul trap, like micromotion, heating rates, and ac magnetic fields. Furthermore, we present ground state cooling of an Al+/Ca+ two-ion crystal.
Keywords: optical clocks; ion trapping; transportable