Bulletin of the American Physical Society
53rd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 67, Number 7
Monday–Friday, May 30–June 3 2022; Orlando, Florida
Session U03: Searches for New Physics (GPMFC)
2:00 PM–4:00 PM,
Thursday, June 2, 2022
Room: Grand Ballroom B
Chair: Paul Hamilton, UCLA
Abstract: U03.00001 : Searches for new physics with Yb+ optical clocks
2:00 PM–2:30 PM
Presenter:
Nils Huntemann
(Physikalisch-Technische Bundesanstalt, Germany)
Author:
Nils Huntemann
(Physikalisch-Technische Bundesanstalt, Germany)
Using two caesium fountain clocks, we determine the E3 transition frequency at 642 THz with 80 mHz uncertainty, the most accurate determination of an optical transition frequency to date. In addition to the E3 transition, the Yb+ ion also provides an electric quadrupole (E2) that can be employed in an optical clock. The ratio of the E3 and E2 transition frequencies has been determined in experiments with single laser-cooled trapped ions with a fractional uncertainty of 3×10-17. Repeated measurements of both quantities over several years are analyzed for potential violations of local position invariance [3]. Including recent results, we improve by factors of more than 20 and 2 the limits on temporal variations of the fine structure constant α to below 10-18/yr and of the proton-to-electron mass ratio to 4×10-17/yr.
[1] C. Sanner, et al., Nature 567, 204 (2019).
[2] R. Lange, et al., PRL 127, 213001 (2021).
[3] R. Lange et al., PRL 126, 011102 (2021).
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