Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 48: Poster – Quantum Optics, Technologies, and Optomechanics

Q 48.53: Poster

Mittwoch, 12. März 2025, 17:00–19:00, Tent

Optical setup for co-trapping Yb⁺ and Ba⁺ ions in a cryogenic trapped-ion quantum computer — •Ernst Alfred Hackler, Daniel Busch, Patrick Huber, Dorna Niroomand, and Christof Wunderlich — Universität Siegen, Siegen, Germany

A novel cryogenic (4K) trapped ion quantum computer with integrated cryogenic control electronics (BMBF funded project ATIQ) requires an optical set-up for delivering laser light to cool and state selectively prepare and detect Yb⁺ and Ba⁺ ions. Here, we present the development process and simulation of all key components of this optical set-up. A major challenge in designing optics for the above-mentioned purpose is the wide wavelength range, which causes significant differences in dispersion and absorption for a given material. First, we introduce a new overlapping unit, which combines nine different wavelengths ranging from UV to near-IR in two separate arms. Second, we describe the achromatic beam delivery system, which transports the combined laser beams from the overlapping unit to the ions confined in a planar, micro-structured Paul trap within the cryostat. Third, we present a newly developed reflective imaging system based on a Schwarzschild objective designed by the Institute of Quantum Optics from Leibniz Universität Hannover that enables simultaneous imaging of all wavelengths in the experiment into one focal plane, in which the camera is placed. Since only two fluorescence wavelengths are relevant for state selective detection while all other wavelengths, along with stray light from the environment, presents background noise, we have designed a specifically tailored double bandpass filter to optimize detection.

Keywords: Imaging; Ion Trap; Quantum Computing