Erlangen 2022 – scientific programme

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A: Fachverband Atomphysik

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

A 30.8: Poster

Thursday, March 17, 2022, 16:30–18:30, P

PTB’s transportable Al⁺ ion clock - concept and current status — •Constantin Nauk¹, Benjamin Kraus^1,2, Stephan Hannig^1,2, and Piet O. Schmidt^1,2,3 — ¹Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — ²DLR-Institute for Satellite Geodesy and Inertial Sensing, 30167 Hannover, Germany — ³Leibniz Universität Hannover, Institut für Quantenoptik, 30167 Hannover, Germany

Optical atomic clocks provide significantly lower fractional systematic and statistical frequency uncertainties compared to state-of-the-art microwave atomic clocks. A particularly promising candidate for high-accuracy applications is ²⁷Al⁺ as its ¹S₀ → ³P₀ transition is relatively insensitive towards external electromagnetic fields, especially to black body radiation. However, direct laser cooling of ²⁷Al⁺ is more than challenging. Instead, the clock ion can be cooled sympathetically by a co-trapped and well-controllable ⁴⁰Ca⁺ ion, which additionally allows state detection of the Al⁺ ion via quantum logic spectroscopy.
Besides its design, we present the current status of our transportable ion quantum logic optical clock towards fractional frequency uncertainties on the order of 10⁻¹⁸ and review compact and robust breadboarding for UV laser systems.