Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 41: Superconducting Qubits (joint session QI/TT)
TT 41.12: Vortrag
Mittwoch, 20. März 2024, 12:30–12:45, HFT-FT 131
Suppression of coherent errors in Cross-Resonance gates via recursive DRAG — •Boxi Li1,2, Tommaso Calarco1,2,3, and Felix Motzoi1 — 1Forschungszentrum Jülich, Institute of Quantum Control (PGI-8), D-52425 Jülich, Germany — 2Institute for Theoretical Physics, University of Cologne, D-50937 Cologne, Germany — 3Dipartimento di Fisica e Astronomia, Università di Bologna, 40127 Bologna, Italy
The high-precision control of quantum logical operations is a prerequisite to increasing circuit depths in quantum processors, implementing useful quantum algorithms, and reaching fault-tolerant scalable architectures. A ubiquitous approach used for entangling gates has been all-microwave control of superconducting qubits, primarily using the Cross-Resonance two-qubit gate; however, fidelities are still limited by control imperfections. Here, we derive a universal analytical pulse shape that significantly improves fidelities in Cross-Resonance gates, suppressing both the three off-resonant transitions on the control qubit and unwanted two-qubit rotation operators. Experimentally tested on the IBM Quantum Platform, our proposed drive pulse demonstrates successful suppression of coherent errors, allowing for much faster gates than the current state-of-the-art. Despite limited remote access, across multiple qubit pairs, we achieve a notable two to threefold reduction in error for the CNOT gate, resulting in coherence-limited gates with fidelities in the 99.7% range, higher than any publicly accessible CNOT gate on the IBM Quantum Platform.
Keywords: Superconducting qubits; Quantum control; Cross-resonance gate; Derivative Removal by Adiabatic Gate