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Q: Fachverband Quantenoptik und Photonik
Q 19: Quantum Technologies – Ion Traps
Q 19.7: Talk
Tuesday, March 3, 2026, 12:30–12:45, P 5
Advancements in ion trap quantum computing with multiple ion species — •David C. Stuhrmann1, Sascha Agne2, Najwa Al-Zaki1, Erik Dunkel1, Radhika Goyal1, Tobias Pootz1, Kevin Rempel1, 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
In the context of scalable quantum computing hardware with high-fidelity qubits, surface electrode ion traps are one of the most promising platforms. The long coherence times and very high fidelities of hyperfine qubits have been demonstrated on small numbers of ions. The ongoing challenge lies in scaling up the systems in terms of size, a process which necessitates improvements in hardware, as well as in experimental techniques. Building on the expertise of our existing room temperature experiments with near field microwave qubit interactions we present the next generation of cryogenic experiments. Our upgraded laser systems and the use of multiple ion species (Beryllium, Calcium, Strontium) position us for the adoption of integrated optics and sympathetic cooling. New ion trap geometries can be efficiently evaluated and include the ability to shuttle ions to dedicated zones to raise the number of addressable ions. The subsequent step is to establish automated calibration and monitoring procedures to optimize the device's uptime and remote connectivity for future applications.
Keywords: trapped ions; quantum computing; sympathetic cooling; integrated optics; hyperfine qubits