Suppressing microwave crosstalk in superconducting quantum processors by designing parasitic drive capacitances
Abstract
As superconducting quantum processors scale to large qubit counts, unwanted microwave drive crosstalk becomes an important source of coherent errors. Here, we investigate the role of parasitic coupling paths in the suppression of drive crosstalk in a processor with two fixed-frequency transmon qubits and a tunable coupler. To account for the many different coupling paths, we develop a detailed circuit model to capture the dependence of crosstalk on the coupler frequency. We experimentally demonstrate suppression of crosstalk, finding that the suppression does not originate solely from cancellation of the effective qubit-qubit coupling, but also is a result of interference between other coupling paths. Building on these insights, we show that drive crosstalk can be suppressed with the right choice of parasitic capacitances, which otherwise often are treated as unwanted design imperfections. Our results provide practical guidance for low-crosstalk device design of superconducting quantum processors and point toward a broader strategy in which parasitic coupling paths are engineered rather than simply minimized.
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BibTeX
@misc{aggarwal2026suppressing,
title = {{Suppressing microwave crosstalk in superconducting quantum processors by designing parasitic drive capacitances}},
author = {Anuj Aggarwal and Jorge Fernández-Pendás and Simon Pettersson Fors and Zakaria Mohamed and Halldór Jakobsson and Amr Osman and Janka Biznárová and Andreas Nylander and Anita Fadavi Roudsari and Marcus Rommel and Anton Frisk Kockum and Giovanna Tancredi},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.36365},
eprint = {2610.36365},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.36365},
note = {CC BY-NC-SA 4.0},
}
RIS
TY - UNPB
TI - Suppressing microwave crosstalk in superconducting quantum processors by designing parasitic drive capacitances
AU - Anuj Aggarwal
AU - Jorge Fernández-Pendás
AU - Simon Pettersson Fors
AU - Zakaria Mohamed
AU - Halldór Jakobsson
AU - Amr Osman
AU - Janka Biznárová
AU - Andreas Nylander
AU - Anita Fadavi Roudsari
AU - Marcus Rommel
AU - Anton Frisk Kockum
AU - Giovanna Tancredi
PY - 2026
DA - 2026/10/26
PB - arXiv
DO - 10.48550/arxiv.2610.36365
UR - https://arxiv.org/abs/2610.36365
AB - As superconducting quantum processors scale to large qubit counts, unwanted microwave drive crosstalk becomes an important source of coherent errors. Here, we investigate the role of parasitic coupling paths in the suppression of drive crosstalk in a processor with two fixed-frequency transmon qubits and a tunable coupler. To account for the many different coupling paths, we develop a detailed circuit model to capture the dependence of crosstalk on the coupler frequency. We experimentally demonstrate suppression of crosstalk, finding that the suppression does not originate solely from cancellation of the effective qubit-qubit coupling, but also is a result of interference between other coupling paths. Building on these insights, we show that drive crosstalk can be suppressed with the right choice of parasitic capacitances, which otherwise often are treated as unwanted design imperfections. Our results provide practical guidance for low-crosstalk device design of superconducting quantum processors and point toward a broader strategy in which parasitic coupling paths are engineered rather than simply minimized.
ER -