Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 20: Atom & Ion Clocks and Metrology I
Q 20.5: Vortrag
Dienstag, 11. März 2025, 12:15–12:30, HS Botanik
Recent advances of PTB’s transportable Al+ ion clock — •Constantin Nauk1,2, Joost Hinrichs1,2, Gayatri Sasidharan1,2, Vanessa Galbierz1, Benjamin Kraus1, Sofia Herbers1, and Piet O. Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Leibniz Universität Hannover, Institut für Quantenoptik, 30167 Hannover, Germany
Optical atomic clocks demonstrate exceptional fractional systematic and statistical frequency uncertainties on the order of 10−18, opening the door to novel applications. In particular, transportable clocks enable applications in relativistic geodesy, e.g. height measurements at the cm level or dynamic Earth monitoring, which require highly robust and reliable hardware.
We present a transportable clock setup based on the 1S0 → 3P0 transition in 27Al+, utilizing a co-trapped 40Ca+ ion to enable state detection and cooling through quantum logic spectroscopy and sympathetic cooling. The physics package is fully integrated in commercial 19" racks and comprises an ion trap in an aluminum/titanium composite vacuum system. We detail the optimization of ion loading efficiency, Doppler cooling, and micromotion compensation. Additionally, we show characterization measurements, including trap temperatures, secular motion, and ion swap rates. Finally, we demonstrate coherent manipulation on the S1/2→ D5/2 transition in 40Ca+, required for quantum logic spectroscopy.
Keywords: high-accuracy; optical clock; Calcium; transportability; vacuum