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SAMOP 2021 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 4: Precision spectroscopy of atoms and ions (joint session A/Q)

Q 4.3: Poster

Monday, September 20, 2021, 16:30–18:30, P

Current status of the Al+ ion clock at PTB — •Fabian Dawel1,2, Johannes Kramer1,2, Steven A. King1,2, Ludwig Krinner1,2, Lennart Pelzer1,2, Stephan Hannig1,2,3, 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 — 3DLR, Institut für Satellengeodäsie und Inertialsensorik (DLR-SI)

Since 1967 time is defined via a hyperfine transition in caesium-133. Optical clocks offer advantages in terms of statistical and systematic uncertainties over microwave clocks. A particularly promising candidate is the transition 1S03P0 of 27Al+, with advantageous atomic properties resulting in small uncertainties in magnetic, electric and black-body shifts. Here we review 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. First measurements on the Al+ clock transition will be presented with a power-broadened linewidth of 48 Hz.

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