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Q: Fachverband Quantenoptik und Photonik

Q 53: Precision Spectroscopy of Atoms and Ions IV (joint session A/Q)

Q 53.7: Vortrag

Donnerstag, 5. März 2026, 12:45–13:00, N 3

Assessment of the differential polarizability of Yb⁺ and Sr⁺ clock transitions — •Martin Steinel¹, Thomas Lindvall², Marianna Safronova³, Melina Filzinger¹, Jian Jiang¹, Saaswath JK¹, Ekkehard Peik¹, and Nils Huntemann¹ — ¹Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig — ²VTT Technical Research Centre of Finland, National Metrology Institute VTT MIKES, P.O. Box 1000, 02044 VTT, Finland — ³University of Delaware, Newark, USA

Optical clocks are leading candidates for a redefinition of the second, with estimated fractional uncertainties at the 6 × 10⁻¹⁹ level [1]. Room-temperature ¹⁷¹Yb⁺ clocks operating on the S_1/2 → F_7/2 electric-octupole (E3) transition currently reach 3 × 10⁻¹⁸ [2], limited by the blackbody-radiation (BBR) shift Δν_BBR ∝ Δα  T⁴. The dominant uncertainty arises from the ∼ 2% accuracy of the differential polarizability Δα, determined from measurements of the light shift induced by an infrared laser with calibrated optical power and in-situ estimate of the beam profile. In contrast, a method balancing the Stark and Doppler shift caused by excess micromotion yields a Δα uncertainty of 0.04% for ⁸⁸Sr⁺ [3]. We present direct comparisons of both techniques using ⁸⁸Sr⁺ and determine the ratio of Δα for ¹⁷¹Yb⁺ and ⁸⁸Sr⁺, enabling a potential reduction of the E3 BBR-shift uncertainty to 2 × 10⁻¹⁹.

[1] M. C. Marshall et al., Phys. Rev. Lett. 135, 033201 (2025) [2] N. Huntemann et al., Phys. Rev. Lett. 116, 063001 (2016) [3] T. Lindvall et al., Phys. Rev. Lett. 135, 043402 (2025)

Keywords: Optical clock; Black body radiation; Polarizability; Multi-ion clock; Intensity calibration