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Q: Fachverband Quantenoptik und Photonik

Q 15: Atom and Ion Qubits (joint session QI/Q)

Q 15.1: Invited Talk

Monday, March 10, 2025, 17:00–17:30, HS II

Trapped-ion quantum computers based on chip-integrated microwave control — •Christian Ospelkaus — Institut für Quantenoptik, Leibniz Universität Hannover, Germany — Physikalisch-Technische Bundesanstalt, Braunschweig, Germany

We pursue the implementation of quantum gates using chip-integrated microwave conductors rather than the widely used laser beams for scalability, gate fidelity and chip-level integration of functionality. Previous demonstrations of this method have used a single carefully crafted two-qubit gate combined with single-qubit addressing pulses. Here we show for the first time the execution of arbitrary algorithms on a pair of qubits by implementing the cycle benchmarking protocol and thus a universal computation register. To further integrate the control of the qubits at the chip structure, we demonstrate the generation of the microwave control signals qubits using a cryogenic DDS chip that can be directly integrated with the trap chip. Recent advances in the fabrication of scalable trap structures will be presented, in particular the implementation of through-substrate vias (TSVs) and hybrid integration methods. We present two cryogenic quantum computer demonstrator setups that are currently under construction, combining the computation register with storage and preparation/readout registers and interconnected through an X-junction.

This work has been supported by the Ministry of Science and Culture of Lower Saxony through the QVLS-Q1 project, by BMBF through the ``MIQRO'', ``ATIQ'' and ``QuMIC'' projects and by the EU through Millenion-SGA1.