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QI: Fachverband Quanteninformation

QI 8: Implementations III

QI 8.2: Vortrag

Dienstag, 10. März 2026, 14:15–14:30, BEY/0137

Accelerated CZ gates on Tunable Fluxonium architecture — •Aneesh Anand Kamat^{1, 2}, Dimitrios Georgiadis^{1, 3}, Francisco Cárdenas-López¹, and Felix Motzoi^{1, 3} — ¹Peter Grünberg Institute, Quantum Control (PGI-8), Forschungszentrum Jülich GmbH, 52425 Jülich, Germany — ²Institute for Quantum Information, RWTH Aachen University, 52056 Aachen, Germany — ³Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany

Fluxonium qubits offer superior coherence for large-scale superconducting processors, but their protected nature complicates standard entangling schemes due to smaller matrix elements. The Fluxonium-Transmon-Fluxonium (FTF) architecture leverages a flux-tunable Transmon coupler to mediate interaction, enabling stronger effective couplings for fast gates. We analyze the error budget for a flux-controlled CZ gate in the FTF architecture by characterizing the dominant leakage channels for experimentally realized systems, and developing the strategies to remove them using quantum optimal control.

Keywords: Fluxonium Qubits; CZ Gate; Tunable Coupler; Error Budget; Optimal Control