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Q: Fachverband Quantenoptik und Photonik
Q 26: Poster – Precision Measurement, Metrology, and Quantum Effects
Q 26.6: Poster
Dienstag, 11. März 2025, 14:00–16:00, Tent
High accuracy multi-ion clock operation — •Shobhit S. Dey1, Ingrid M. Richter1, H. Nimrod Hausser1, Jonas Keller1, and Tanja E. Mehlstäubler1,2 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Leibniz Universität Hannover, Hannover, Germany
Optical clocks based on multiple trapped ions have the potential for maintaining the remarkably low systematic uncertainties obtained in present single-ion systems [1], while reducing statistical uncertainties [2]. We operate a clock based on mixed-species Coulomb crystals, with 115In+ clock ions sympathetically cooled by 172Yb+ ions. In operation with a single In+ ion, at a systematic uncertainty of 2.5×10−18, we have performed frequency comparisons – including the most accurate to date – with other optical clocks [3]. With an increased clock ion number N, the instability follows the expected 1/√N scaling.
In this contribution, we provide experimental details for the automated operation of mixed-species clocks. To obtain reproducible sympathetic cooling conditions, our system autonomously applies a sorting sequence, ensuring favorable positions of the cooling ions within the crystal. We also derive an instability limit for decay-based state preparation of multiple clock ions [4], which we have surpassed by addition of a quench laser.
[1] S. M. Brewer et al., Phys. Rev. Lett. 123, 033201 (2019)
[2] J. Keller et al., Phys. Rev. A 99, 013405 (2019)
[3] H. N. Hausser et al., arXiv:2402.16807 (2024)
[4] J. Keller et al., J. Phys.: Conf. Ser. 2889, 012050 (2024)
Keywords: Optical Clock; Trapped Ions; Quantum Metrology