Mainz 2026 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
Q: Fachverband Quantenoptik und Photonik
Q 63: Precision Spectroscopy of Atoms and Ions V (joint session A/Q)
Q 63.1: Vortrag
Donnerstag, 5. März 2026, 14:30–14:45, N 3
Indium multi-ion clock operation and investigations of ground state cooling — •Shobhit Saheb Dey1, Ingrid Maria Richter1, Mouhamed-Omar Manai1, Hartmut Nimrod Hausser1, Dongliang Cong1, Jonas Keller1, and Tanja E. Mehlstäubler1,2 — 1Physikalisch-Technische Bundesanstalt, Braunschweig — 2Institut für Quantenoptik, Leibniz Universität Hannover
Optical clocks based on trapped ions are pushing forward the limits of time and frequency metrology with systematic uncertainties approaching the low 10−19 range, while their stability stays fundamentally limited by the Quantum Projection Noise(QPN). Uncorrelated parallel interrogation of N ions is expected to scale down the QPN limited instability by 1/√N. We establish this scaling up to 8 ions in a 115In+−172Yb+ Coulomb crystal clock interrogating the 1S0−3P0 clock transition of 115In+ and Doppler cooling via 172Yb+ ions. Thermal motion of ions at Doppler temperature causes a time-dilation (TD) shift, which is among the largest contributors to the systematic-uncertainty budget in the ion based clocks today.
Thus, we are currently investigating ground state cooling of Coulomb crystal with tens of ions using the 360 kHz wide 1S0−3P1 intercombination line in 115In+. This is expected to reduce relative shifts due to the TD to low-10−19 regime and we can spectroscopically measure the TD shift via interleaved clock operation.
Keywords: Optical clock, atomic physics, metrology