Freiburg 2024 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster VI

Q 55.16: Poster

Donnerstag, 14. März 2024, 17:00–19:00, Tent B

Towards Sympathetic Cooling of Ytterbium Ions Using Sub-Doppler Cooled Barium Ions in a Novel Planar Micro-Structured Segmented Linear Paul Trap — •Pedram Yaghoubi, Florian Köppen, Ernst Alfred Hackler, Dorna Niroomand, Michael Johanning, and Christof Wunderlich — Department of Physics, School of Science and Technology, University of Siegen, 57068 Siegen, Germany

Sympathetic cooling of trapped ions in an inhomogeneous magnetic field is important for various applications in quantum information processing, quantum simulation, and precision measurements. We work towards sub-Doppler cooling of Barium ions and their use for sympathetically cooling Ytterbium ions [1]. We use a novel planar micro-structured segmented linear Paul trap to trap Yb+ and Ba+ ions simultaneously. Two schemes for Electromagnetically Induced Transparency (EIT) cooling tailored to the use in inhomogeneous magnetic fields are investigated, the first one takes advantage of Zeeman sublevels of the S1/2-P1/2 transition, and the second includes sublevels of the D3/2 state in 138Ba+. We showcase the outcomes of numerical simulations for various cooling methods, indicating that ions can achieve mean phonon numbers of 0.9 at rates of a few kHz in the axial mode at 150 kHz secular trap frequency. Furthermore, details of the experimental setup and first measurement results are presented. Specifically, we investigate tailored EIT cooling schemes in the absence and presence of magnetic field gradients. References [1] K. Sosnova, et al., Physical Review A 103, 012610 (2021)