Dresden 2026 – scientific programme
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QI: Fachverband Quanteninformation
QI 13: Quantum Control
QI 13.7: Talk
Wednesday, March 11, 2026, 17:00–17:15, BEY/0245
Analytical flux-tuned iSWAP pulse suppressing leakage channels — •Dimitrios Georgiadis1,2, Boxi Li1, Francisco Cardenas Lopez1, and Felix Motzoi1,2 — 1Forschungszentrum Jülich GmbH, Peter Grünberg Institute, Quantum Control (PGI-8), 52425 Jülich, Germany — 2Institute for Theoretical Physics, University of Cologne, Zülpicher Straße 77, 50937 Cologne, Germany
Achieving fast, high-fidelity qubit gates remains one of the major challenges in quantum computing, and despite recent progress, enhancing the efficiency of superconducting two-qubit gates still presents complications. In this work we investigate optimal control methods in order to improve the fidelity of two qubit gates in a flux tunable architecture based on a tunable coupler. We emphasize the importance of suppression of various leakage channels and we demonstrate simulations with analytical optimal control methods, (DRAG) and (DRAG-like), on the external flux on the tunable coupler, achieving further improved fidelities for an iSWAP gate. Finally, we propose a generalized pulse-shaping approach for the external flux, leading to significant leakage suppression across different circuit parameters.
Keywords: two qubit gates; iSWAP; superconducting; tunable couplers