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Erlangen 2022 – scientific programme

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A: Fachverband Atomphysik

A 30: Precision Measurements and Metrology II (joint session Q/A)

A 30.3: 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. Schmidt1,21QUEST 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 1S03P0 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.

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