Quantum 2025 – wissenschaftliches Programm
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MON: Monday Contributed Sessions
MON 6: QIP Implementations: Trapped Ions
MON 6.2: Vortrag
Montag, 8. September 2025, 14:30–14:45, ZHG007
Register-Based Trapped-Ion Quantum Processors with Near-Field Microwave Control — •Florian Ungerechts1, Rodrigo Munoz1, Janina Bätge1, M.Masum Billah1, Axel Hoffmann1,2, Giorgio Zarantonello1,3, and Christian Ospelkaus1,4 — 1Inst. f. Quantenoptik, Leibniz Universität Hannover — 2Inst. f. Hochfrequenztechnik und Funksysteme, Leibniz Universität Hannover — 3QUDORA Technologies GmbH — 4Physikalisch-Technische Bundesanstalt
Trapped ions are a leading platform for quantum information processing, offering long coherence times, high gate fidelities, and unmatched quantum volume. Scalable architectures, such as the Quantum Charged Coupled Device (QCCD) architecture, enable all-to-all connectivity between atomic ion qubits in dedicated registers and can be implemented on microfabricated surface-electrode traps. However, as chip size increases, external free-space lasers become infeasible. To address this, quantum logic gates with chip-integrated microwave conductors have been demonstrated, also eliminating spontaneous emission as an intrinsic error source in laser-driven gates. Although shown individually, combining the QCCD architecture with the near-field microwave control technique into scalable devices is a current research topic. We present an overview of our recently developed surface-electrode traps for near-term quantum information processing with up to 50 atomic ion qubits. We compare the chip architectures and highlight the design of radiofrequency junctions, bucket-brigade storage registers, and chip-integrated microwave conductors.
Keywords: quantum information processing; quantum computing; trapped ions; QCCD architecture; near-field microwave control