Bonn 2025 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster – Quantum Information Technologies (joint session Q/QI)
Q 62.30: Poster
Thursday, March 13, 2025, 17:00–19:00, Tent
Neutral Ca fluorescence during ablation loading for surface ion traps — •David C Stuhrmann1, Radhika Goyal1, Tobias Pootz1, Sascha Agne2, Celeste Torkzaban1, and Christian Ospelkaus1,2 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany — 2Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
Surface electrode ion traps are well suited for building a scalable quantum computer because ions trapped in a Paul trap can have long coherence times combined with high fidelities. For trapping 40Ca+ ions I need to generate a stream of individual ions reaching the trap center. This is achieved by a laser ablation process together with a two step photo-ionization which uses a resonant 423nm laser and free-running 375nm laser. As a measure of the amount of released Ca atoms from ablation I study neutral Ca fluorescence with the 423nm resonant transition. The time resolved fluorescence signal is used to scan the laser powers and positions. A frequency scan of the 423nm beam shows how many atoms of a certain velocity class get released and that a detuning of 500 MHz or less are desirable. The signal strength is also used for finding the optimal horizontal and vertical position of ablation laser as well as determining the ablation threshold. The results show that our ablation setup is suited for generating Ca+ ions and that we can adjust our various laser parameters.
Keywords: trapped ions; laser ablation; time-resolved fluorescence