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Q: Fachverband Quantenoptik und Photonik
Q 59: Precision Measurements and Metrology II (joint session Q/A)
Q 59.9: Poster
Donnerstag, 17. März 2022, 16:30–18:30, P
Decreasing ion optical clock instability by multi-ion operation — •Hartmut Nimrod Hausser1, Tabea Nordmann1, Jan Kiethe1, Jonas Keller1, Nishant Bhatt1, Moritz von Boehn1, and Tanja E. Mehlstäubler1,2 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Leibniz Universität Hannover, Hannover, Germany
The statistical uncertainty of single-ion clocks is fundamentally limited by quantum projection noise which can be reduced by scaling up the number of ions [1]. We are working on a demonstration of a multi-ion clock using 115In+ clock ions, sympathetically cooled by 172Yb+ in a linear segmented Paul trap. This trap is optimized for multi-ion operation and offers e. g. low axial micromotion for spatially extended linear Coulomb crystals and low heating rates [2]. We discuss sympathetic cooling of mixed-species crystals and its dependence on the cooling ion positions. To ensure reproducible conditions in the presence of decrystallizing background gas collisions, we experimentally implement crystal ordering sequences and characterize their reliability. Chains up to 10 In+ ions can be ordered with reliabilities >90%. We show multi-ion spectroscopy results with a fixed crystal configuration, obtained by conditionally triggering such sequences when required.
[1] N. Herschbach et al., Appl. Phys. B 107, 891-906 (2012)
[2] J. Keller et al., Phys. Rev. A 99, 013405 (2019)