Erlangen 2018 – scientific programme
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A: Fachverband Atomphysik
A 35: Ultracold Atoms I (joint session Q/A)
A 35.4: Talk
Thursday, March 8, 2018, 11:15–11:30, K 1.022
Radio-frequency sideband cooling and sympathetic cooling of trapped ions in a static magnetic field gradient — Theeraphot Sriarunothai1, •Gouri Shankar Giri1, Sabine Wölk1,2, and Christof Wunderlich1 — 1Department Physik, Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Walter-Flex-Str. 3, 57068 Siegen, Germany — 2Institute for Theoretical Physics, University of Innsbruck, Technikerstraße 21a, 6020 Innsbruck, Austria
We report a detailed investigation on near-ground state cooling of one and two trapped atomic ions [1]. We introduce a simple RF sideband cooling method for confined atoms and ions, using RF radiation applied to bare ionic states in a static magnetic field gradient, and demonstrate its application to ions confined at secular trap frequencies, ωz ≈ 2π× 117 kHz. For a single 171Yb+ ion, the sideband cooling cycle reduces the average phonon number, ⟨ n ⟩ from the Doppler limit to ⟨ n ⟩= 0.30(12). This is in agreement with the theoretically estimated lowest achievable phonon number in this experiment. We extend this method of RF sideband cooling to a system of two 171Yb+ ions, resulting in a phonon number of ⟨ n ⟩= 1.1(7) in the center-of-mass mode. Furthermore, we demonstrate the first realisation of sympathetic RF sideband cooling of an ion crystal consisting of two individually addressable identical isotopes of the same species.
[1] Th. Sriarunothai et al., arXiv: 1710.09241 (2017)