Parametric DRAG for leakage-suppressed exchange gates in superconducting qubits
Abstract
Parametric frequency modulation makes superconducting interactions programmable for quantum gates and quantum simulation. Leakage into higher transmon levels and coupler modes degrades gate fidelity and takes simulated dynamics outside the intended state space. Simple pulse shaping reduces off-resonant excitation, while strong coupling and short pulses demand simultaneous control of multiple leakage pathways. Controlling these pathways across individual exchange operations and simultaneous couplings is essential for fast gates and faithful programmable dynamics. We introduce parametric derivative removal by adiabatic gate (PDRAG), combining derivative shaping and finite-pulse calibration for qubit and coupler modulation. At an interqubit coupling of g/2π=100 MHz, simulations demonstrate 13-ns exchange operations, approaching the timescale of fast single-qubit gates. Combined with calibrated phase accumulation, these pulses realize a two-parameter fSim gate family with infidelity below 1.8×10−7. For quantum simulation, PDRAG suppresses leakage and improves fidelity in continuous and digital Floquet simulations of Su--Schrieffer--Heeger chains. Floquet analysis identifies finite-pulse return interference as the calibration mechanism; realistic-circuit transfer preserves suppression. PDRAG establishes a unified framework spanning quantum gates and quantum simulation.
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BibTeX
@misc{li2026parametric,
title = {{Parametric DRAG for leakage-suppressed exchange gates in superconducting qubits}},
author = {Yiwen Li and Xinsheng Tan and Yang Yu},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.37296},
eprint = {2609.37296},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.37296},
}
RIS
TY - UNPB
TI - Parametric DRAG for leakage-suppressed exchange gates in superconducting qubits
AU - Yiwen Li
AU - Xinsheng Tan
AU - Yang Yu
PY - 2026
DA - 2026/09/29
PB - arXiv
DO - 10.48550/arxiv.2609.37296
UR - https://arxiv.org/abs/2609.37296
AB - Parametric frequency modulation makes superconducting interactions programmable for quantum gates and quantum simulation. Leakage into higher transmon levels and coupler modes degrades gate fidelity and takes simulated dynamics outside the intended state space. Simple pulse shaping reduces off-resonant excitation, while strong coupling and short pulses demand simultaneous control of multiple leakage pathways. Controlling these pathways across individual exchange operations and simultaneous couplings is essential for fast gates and faithful programmable dynamics. We introduce parametric derivative removal by adiabatic gate (PDRAG), combining derivative shaping and finite-pulse calibration for qubit and coupler modulation. At an interqubit coupling of g/2π=100 MHz, simulations demonstrate 13-ns exchange operations, approaching the timescale of fast single-qubit gates. Combined with calibrated phase accumulation, these pulses realize a two-parameter fSim gate family with infidelity below 1.8×10^−7. For quantum simulation, PDRAG suppresses leakage and improves fidelity in continuous and digital Floquet simulations of Su--Schrieffer--Heeger chains. Floquet analysis identifies finite-pulse return interference as the calibration mechanism; realistic-circuit transfer preserves suppression. PDRAG establishes a unified framework spanning quantum gates and quantum simulation.
ER -