Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 68: Poster – Precision Measurement (joint session Q/A)
Q 68.9: Poster
Donnerstag, 5. März 2026, 17:00–19:00, Philo 2. OG
Advancements of a transportable quantum logic optical clock. — •Sofia Herbers1, M. Mazin Amir1,2, Alexander Bernet1,2, Pascal Engelhardt1,2, Joost Hinrichs1,2, Constantin Nauk1,2, Gayatri Sasidharan1,2, and Piet O. Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany — 2Leibniz Universität Hannover, 30167 Hannover, Germany
Research in the field of geodesy [1,2], fundamental physics [3], and large scale networks can be performed and complemented with optical clocks. Besides stationary systems, this research also requires transportable systems, which can be operated at different points of interest. We set up a transportable quantum logic optical clock based on 27Al+ and 40Ca+ and present our latest advancements. We optimized the loading process of a two-ion crystal by an automated two-step splitting protocol. Additionally, we set up a compact, single-pass, and frequency-stable fourth harmonic generation (FHG) to generate 267 nm light for driving the clock transition of 27Al+, for which we demonstrated a fractional frequency instability below 5 × 10−17 for the phase-stable light transfer through the FHG at one second averaging time. Furthermore, we optimized our cooling protocol, and investigated magnetic field attenuation using a mu-metal shield. [1] T. E. Mehlstäubleret al. (2018), Rep. Prog. Phys. 81, 064401 [2] Safronova et al. (2018), Rev. Mod. Phys., 90, 025008 [3] Vincent et al. (2024), arXiv preprint arXiv:2411.07888
Keywords: optical clock; precision spectroscopy; ion clock