SAMOP 2021 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 2: Precision spectroscopy of atoms and ions (joint session A/Q)
A 2.3: Poster
Montag, 20. September 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. Schmidt1,2 — 1QUEST 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 1S0 → 3P0 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.