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Q: Fachverband Quantenoptik und Photonik

Q 26: Poster – Precision Measurement, Metrology, and Quantum Effects

Q 26.28: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Transportable highly stable laser system for an Al⁺/Ca⁺ quantum logic clock — •Gayatri R. Sasidharan¹, Benjamin Kraus¹, Sofia Herbers¹, Fabian Dawel^1,2, Constantin Nauk^1,2, Joost Hinrichs^1,2, Vanessa Galbierz¹, Pascal Engelhardt^1,2, and Piet O. Schmidt^1,2 — ¹Physikalisch-Technische Bundesanstalt, 38116 Braunchweig, Germany — ²Leibniz Universität Hannover, Institut für Quantenoptik, 30167 Hannover, Germany

Optical clocks offers fractional frequency uncertainties down to 10⁻¹⁸, making them suitable candidates for applications ranging from dark matter research, redefinition of the SI second to geodesy. With these applications in mind, we develop a transportable clock based on Al⁺. The cooling and detection transitions of the clock ion species ²⁷Al⁺ are not directly accessible and therefore a co-trapped Ca⁺ ion is used for sympathetic cooling and state readout through quantum logic spectroscopy. We present our extensive infrastructure of highly stable laser systems build to address clock and logic transitions precisely on ²⁷Al⁺ and ⁴⁰Ca⁺ respectively [1],[2]. This involves locking laser to stable cavities maintained at 10⁻⁹ mbar pressure levels, stability comparison setups using frequency comb and optical path length stabilization units. We also report on finesse and photo thermal measurements of our dual wavelength coated logic cavity.

[1] B. Kraus, PhD thesis, Leibniz Universität Hannover (2024).

[2] Fabian Dawel, et al., Opt. Express 32, 7276-7288 (2024).

Keywords: Optical clocks; Laser frequency stability; Fabry-Perot cavity; Quantum logic spectroscopy