Simple analytical flux-tuned iSWAP pulses for leakage suppression

Dimitrios Georgiadis, Boxi Li, Asier Galicia, Rami Barends, F.A. Cárdenas-López, Felix Motzoi

Fast, high-fidelity two-qubit gates are a key requirement for fault-tolerant quantum computation. Tunable coupler architectures provide a flexible approach for implementing entangling gates through flux control with large on-off ratios, but fast flux modulation can induce diabatic transitions and population leakage to non-computational states, limiting gate performance. Here we present an analytical flux control method enabling derivative removal by adiabatic gate (Φ-DRAG) for suppressing leakage in flux tunable two-qubit gates. We show that Φ-DRAG differs fundamentally from conventional microwave implementations and derive modified flux modulation protocols that suppress leakage below 10−4 for fast entangling gates. The method remains effective across a range of asymmetry between qubit anharmonicities and different circuit parameters, enabling high-fidelity two-qubit gates within the fifteen nanosecond range.

view on arxiv

Cite as BibTeX

@misc{georgiadis2026simpleanalyticalfluxtunediswap,
title={Simple analytical flux-tuned iSWAP pulses for leakage suppression},
author={Dimitrios Georgiadis and Boxi Li and Asier Galicia and Rami Barends and F. A. Cárdenas-López and Felix Motzoi},
year={2026},
eprint={2606.13052},
archivePrefix={arXiv},
primaryClass={quant-ph},
url={https://arxiv.org/abs/2606.13052},
}

Simple analytical flux-tuned iSWAP pulses for leakage suppression

Dimitrios Georgiadis, Boxi Li, Asier Galicia, Rami Barends, F.A. Cárdenas-López, Felix Motzoi

You May Also Like

Probing the limits of variational quantum algorithms for nonlinear ground states on real quantum hardware: The effects of noise

Variational Quantum Algorithms for Computational Fluid Dynamics