Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Precision Measurements and Metrology: Optical Clocks
Q 13.7: Talk
Monday, March 6, 2017, 18:30–18:45, P 104
Ion dynamics and systematic shifts in a multi-ion atomic clock — •Dimitri Kalincev, Jonas Keller, Tobias Burgermeister, Alexandre Didier, Jan Kiethe, André Kulosa, Tabea Nordmann, Thorben Schmirander, and Tanja E. Mehlstäubler — Physikalisch-Technische Bundesanstalt, Braunschweig, Deutschland
Single ion optical clocks have an estimated systematic fractional frequency uncertainty at the 10−18 level. The main limitation in measuring atomic frequencies is their statistical uncertainty due to the fundamental limit of quantum projection noise. In order to exploit the high accuracy, very long averaging times are required. We show that the statistical uncertainty of single-ion-clocks can be overcome with a multi-ion-approach while keeping excellent control of systematics. For mixed crystals, we analyze effects relevant at the 10−19 level and below. We identify crystal configurations that can be cooled efficiently while having low heating rates.
With a new chip-based linear Paul-trap, designed for low axial micro-motion, we measure heating rates as a function of the ion secular frequency. We simultaneously measure micromotion across an ion Coulomb crystal. Based on experimental results on trap induced shifts and on our calculations, we present an estimated error budget for a multi-ion-clock.