Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster VII
Q 56.29: Poster
Donnerstag, 14. März 2024, 17:00–19:00, KG I Foyer
First aluminium ion clock comparisons at PTB — •Fabian Dawel1,2, Johannes Kramer1,2, Marek Hild1,2, Lennart Pelzer1, Kai Dietze1,2, and Piet O. Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Leibniz Universität Hannover, 30167 Hannover, Germany
A single trapped 27Al+ ion is an excellent frequency reference for an optical clock, as it is largely insensitive to external field shifts. Achieved inaccuracies are below the 10−18 level and thus make aluminum clocks a promising candidate for the re-definition of the SI second and enable for cm-scale height difference measurements in relativistic geodesy. We estimated the systematic uncertainty budget of PTB’s Al+ clock using a single 40Ca+ ion as a sensor. Included in the analysis are shifts by black body radiation, collisions with background gas molecules, residual kinetic energy from uncompensated micromotion and the ac Zeeman shift caused by fast oscillating magnetic fields. The statistical uncertainty is measured by comparing Al+ with the strontium lattice clock at PTB. This clock comparisons also allow us to estimate the absolute frequency and compare it to other frequency ratio measurements.
Keywords: Optical clock; Aluminium clock; Qunatum logic spectroscopy