Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

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

Q 26.5: Poster

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

A high accuracy multi-ion clock with instability below ×10⁻¹⁶/√τ — •Ingrid Maria Richter¹, Shobhit Saheb Dey¹, Hartmut Nimrod Hausser¹, Jonas Keller¹, and Tanja E Mehlstäubler^{1, 2} — ¹Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — ²Leibniz Universität Hannover, Hannover, Germany

Single-ion optical clocks represent some of the most accurate experiments and are applicable in research on high-precision spectroscopy, metrology and geodesy[1]. Although these systems have the potential to reach inaccuracies below 10⁻¹⁸[2], their statistical uncertainty is fundamentally limited by quantum projection noise (QPN) and they require averaging times on the order of weeks to resolve frequencies at this limit.

This motivates our approach to develop a multi-ion system based on ¹¹⁵In⁺ ions within Coulomb crystals sympathetically cooled by ¹⁷²Yb⁺ ions. Next to presenting a systematic frequency uncertainty of 2.5 × 10⁻¹⁸[2] for single-ion operation, we show the scaling of clock instability with number of ions by a factor of 1/√N_ion below 1 × 10⁻¹⁵/√τ. Furthermore, we discuss plans for deploying a second cooling stage to reach the quantum-mechanical ground-state in order to reduce the thermal time dilation shift to below 2 × 10⁻¹⁹.

[1] T. E. Mehlstäubler et al., Rep. Prog. Phys. 81, 064401 (2018)

[2] S. M. Brewer et al., Phys. Rev. Lett. 123, 033201 (2019)

[3] H. N. Hausser et al., arXiv:2402.16807 (2024)

Keywords: Optical Clocks; Spectroscopy; Precision Measurements