Mainz 2026 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 33: Precision Spectroscopy of Atoms and Ions V (joint session A/Q)
A 33.2: Vortrag
Donnerstag, 5. März 2026, 14:45–15:00, N 3
Hyperfine-induced state-dependent lifetime quenching on the 2S1/2 → 2F7/2 elctric octupole transition in 173Yb+ — •Ikbal A. Biswas1, Jialiang Yu1, Anand Prakash2, Clara Zyskind1, Rattakorn Kaewuam3, Piyaphat Phoonthong3, and Tanja E. Mehlstäubler1,2 — 1Physikalisch-Technische Bundesanstalt (PTB), Braunschweig, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover, Hannover, Germany — 3National Institute of Metrology (Thailand), 3/4-5 Moo 3, Klong 5, Klong Luang, 12120 Pathumthani, Thailand
We report the coherent excitation of the highly forbidden 2S1/2 → 2F7/2 clock transition in the odd isotope 173Yb+ with nuclear spin I = 5/2. The measured lifetimes of the Fe = 2,3,4 hyperfine states are shorter than the unperturbed 2F7/2 clock state of 171Yb+ due to hyperfine-induced electric dipole decay channel. This reduced lifetime lowers the required optical power for coherent excitation of the clock transition, thereby reducing the AC Stark shift caused by the clock laser. Using a 3-ion Coulomb crystal, we experimentally demonstrate suppression of the AC Stark shift, a critical improvement for the scalability of future multi-ion Yb+ clocks. Furthermore, we report the the measured hyperfine splitting and calculated quadratic Zeeman sensitivities of the 2F7/2 clock state. Our results pave the way toward multi-ion optical clocks based on 173Yb+.
Keywords: Precision Measurement; Hyperfine Structure; Ac Stark shift; Life time; Multi-ion clock