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Q: Fachverband Quantenoptik und Photonik
Q 67: Poster – Quantum Information
Q 67.10: Poster
Thursday, March 5, 2026, 17:00–19:00, Philo 2. OG
Double side-addressed, high-NA ion trap system leveraging barium towards fault-tolerant quantum computing — Lorenz Panzl1, Tommaso Faorlin1, •Phoebe Grosser1, Rainer Blatt1,2,3, Thomas Feldker3, Alexander Erhard3, Georg Jacob3, Giovanni Cerchiari1,4, and Thomas Monz1,3 — 1Universität Innsbruck, Technikerstraße 25/4, Innsbruck, 6020, Austria — 2Institute for Quantum Optics and Quantum Information (IQOQI), 6020, Innsbruck, Austria — 3Alpine Quantum Technologies (AQT) GmbH, 6020, Innsbruck, 6020, Austria — 4Naturwissenschaftlich- Technische Fakultät, Universität Siegen, Walter-Flex-Straße 3, 57068, Siegen, Germany
We present a high-performance quantum information processing unit based on trapped atomic ions that is designed to push current limits of gate fidelities and SPAM errors to the 10−4 level and below. We utilise barium ions in our experiment due to the long lifetime of the metastable D5/2 state (leading to high readout fidelities) and the availability of hyperfine structure, providing access to the ground-state clock qubit. We demonstrate state preparation fidelity at the 10−4 level and high detection efficiencies. We combine off-resonant, addressed optical pulses and global microwave pulses to perform addressed single-qubit rotations, and demonstrate a novel procedure for implementing a two-qubit geometric phase gate that utilises a transverse gradient to coherently excite the axial modes. In doing so, our experiment is independent of any sub-Hz optical phase stability requirements, as it is outsourced to the RF control.
Keywords: Trapped barium ions; Trapped-ion quantum computing; Geometric phase gate; State preparation; High-fidelity quantum operations