Erlangen 2022 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 59: Precision Measurements and Metrology II (joint session Q/A)
Q 59.3: Poster
Thursday, March 17, 2022, 16:30–18:30, P
Current status of the Al+ ion clock at PTB — •Fabian Dawel1,2, Johannes Kramer1,2, Marek B. Hild1,2, Steven A. King1,2, Ludwig Krinner1,2, Lennart Pelzer1,2, Stephan Hannig1,2, Kai Dietze1,2, Nicolas Spethmann1, and Piet O. Schmidt1,2 — 1QUEST Institute for Experimental Quantum Metrology, Physikalisch Technische Bundesanstalt, 38116 Braunschweig — 2Leibniz Universität Hannover, 30167 Hannover
Since 1967 time is defined via a hyperfine transition in caesium-133. Optical clocks offer advantages over microwave clocks in terms of statistical and systematic uncertainties. A particularly promising candidate is the 1S0 → 3P0 transition of 27Al+. The advantageous atomic properties resulting in small uncertainties in magnetic, electric and black-body shifts. Here we report on the design and operation of the 27Al+ clock at PTB. In our clock implementation, Al+ is co-trapped with 40Ca+ in a linear Paul trap. The working principle of quantum logic spectroscopy and a lifetime-limited excitation rabi cycle on the Al+ logic transition is demonstrated. We will present an evaluation of systematic frequency shifts using the more sensitive Ca+ as a proxy. All investigated shifts have an uncertainty below 10−18. We will show measurements of the ac-Zeeman shift of our trap and unveil first measurements on the Al+ clock transition with a power-broadened linewidth of 48 Hz.