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QI: Fachverband Quanteninformation
QI 8: Implementations III
QI 8.5: Vortrag
Dienstag, 10. März 2026, 15:00–15:15, BEY/0137
Ultrafast Single Qubit Gates through Multi-Photon Transition Removal — •Yuan Gao1,2, Asier Galicia1,2, José Da Costa Jesus3,4, Yebin Liu1, Yorgo Haddad1,2, Dmitriy Volkov1,2, Jéferson Guimarães1,2, Harsh Bhardwaj1,2, Markus Jerger1, Marc Neis1,2, Boxi Li3, Francisco Cárdenas-López3, Felix Motzoi3,4, Pavel Bushev1, and Rami Barends1,2 — 1Institute for Functional Quantum System (PGI-13), Forschungszentrum Jülich, Jülich, Germany — 2Department of Physics, RWTH Aachen University, Aachen, Germany — 3Institute for Quantum Control (PGI-8), Forschungszentrum Jülich, Jülich, Germany — 4Institute for Theoretical Physics, University of Cologne, Cologne, Germany
Qubits typically have multilevel structures making them prone to unwanted transitions from fast gates. Previous works focus on suppressing leakage by mitigating the first to second excited state transition, overlooking multi-photon transitions, and achieving faster gates with further reductions in leakage has remained elusive. Here, we demonstrate single qubit gates with a total leakage error consistently below 2.0×10−5, and obtain fidelities above 99.98% for pulse durations down to 6.8 ns for both X and X/2 gates. This is achieved by removing direct transitions beyond nearest-neighbor levels using a double recursive implementation of the Derivative Removal by Adiabatic Gate (DRAG) method, which we name the R2D method. We also introduce an approach for amplifying leakage error that can precisely quantify leakage rates below 10−6. The presented approaches can be readily applied to other qubit types as well.
Keywords: Quantum Control; Single Qubit Gate; DRAG; Leakage Reduction; Multi-photon transition