Dresden 2026 – scientific programme
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QI: Fachverband Quanteninformation
QI 8: Implementations III
QI 8.6: Talk
Tuesday, March 10, 2026, 15:15–15:30, BEY/0137
Analytical blueprint for 99.999% single-qubit gate fidelities via multi-photon error suppression on present hardware — •José Diogo Da Costa Jesus1,2, Boxi Li1,2, Francisco Cárdenas-López1, and Felix Motzoi1,2 — 1Forschungszentrum Jülich — 2University of Cologne
To attain high-fidelity single-qubit gates on a quantum processor, precise control of the quantum system is required. Nevertheless, such operations suffer from a plethora of errors arising from residual couplings to higher levels, resulting in leakage and phase errors that limit gate accuracy and make this task significantly challenging. Here, we demonstrate that single-qubit gate errors on the order of 10^(-5) can be achieved by introducing simple control methods based on multi-derivative pulse shaping, termed R1D and R2D, which correct the leading sources of error and enable gate infidelities below 10^(-5) for a 7ns pi-rotation in a superconducting ladder system. Moreover, we show that for a gate duration below ten nanoseconds, modeling the ladder as a three-level system does not provide an adequate description, because multi-photon transitions involving the third excited state become a major source of error. Based on this formalism, we also obtain analytical expressions for the drive amplitude and drive detuning allowing further error suppression and simplifying the calibration process. These results demonstrate that analytical pulse-shaping techniques can substantially improve single-qubit gate performance.
Keywords: Superconducting qubits; DRAG; Pulse shapping; Optimal Quantum Control