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A: Fachverband Atomphysik
A 30: Precision Measurements and Metrology II (joint session Q/A)
A 30.5: Poster
Thursday, March 17, 2022, 16:30–18:30, P
Uncertainty Characterization of an In+ Single Ion Clock — •Moritz von Boehn1, Hartmut Nimrod Hausser1, Tabea Nordmann1, Jan Kiethe1, Nishant Bhatt1, Jonas Keller1, Oleg Prudnikov3, Valera I. Yudin3, and Tanja E. Mehlstäubler1,2 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Leibniz Universität Hannover, Hannover, Germany — 3Institute of Laser Physics SB RAS, Novosibirsk, Russia
Nowadays optical ion clocks achieve fractional frequency uncertainties on the order of 10−18 and below. Due to its low systematic shift sensitivities, 115In+ is a promising candidate to go beyond this uncertainty level. Moreover, it has favorable properties for scaling to multiple clock ions, such as a transition for direct state detection [1]. We present the first clock operation in our setup using an 115In+ ion sympathetically cooled by an 172Yb+ ion in a linear Paul trap and its uncertainty characterization at the 10−17 level.
The In+ ion’s residual thermal motion causes a time dilation frequency shift. A way to further decrease the resulting frequency uncertainty is via a reduced final temperature of the cooling process. We report on our progress towards direct laser cooling of indium. Indium offers a narrow intercombination line 1S0 ↔ 3P1 (γ=360 kHz), enabling temperatures close to the motional ground state. Cooling on this transition could sufficiently decrease the time dilation related frequency uncertainty, to allow for overall systematic uncertainties at the 10−19 level [2]. [1] N. Herschbach et al., Appl. Phys. B 107, 891-906 (2012). [2] J. Keller et al., PRA 99, 013405 (2019).