Mitigating crosstalk errors for simultaneous single-qubit gates on a superconducting quantum processor
Abstract
Single-qubit gates on superconducting quantum processors are typically implemented using microwave pulses applied through dedicated control lines. However, these microwave pulses may also drive other qubits due to crosstalk arising from capacitive coupling and wavefunction overlap in systems with closely spaced transition frequencies. Crosstalk and frequency crowding increase errors during simultaneous single-qubit operations relative to isolated gates, thus forming a major bottleneck for scaling superconducting quantum processors. In this work, we combine model-based qubit frequency optimization with pulse shaping to demonstrate crosstalk error mitigation in single-qubit gates on a 49-qubit superconducting quantum processor. We introduce and experimentally verify an analytical model of simultaneous single-qubit gate error caused by microwave crosstalk that depends on a given pulse shape. By employing a model-based optimization strategy of qubit frequencies, we minimize the crosstalk-induced error across the processor and achieve a mean simultaneous single-qubit gate fidelity of 99.96% for a 16-ns gate duration, approaching the mean individual gate fidelity. To further reduce the simultaneous error and required qubit frequency bandwidth on high-crosstalk qubit pairs, we introduce a crosstalk transition suppression (CTS) pulse shaping technique that minimizes the spectral energy around transitions inducing leakage and crosstalk errors. Finally, we combine CTS with model-based frequency optimization across the device and experimentally show a systematic reduction in the required qubit frequency bandwidth for high-fidelity simultaneous gates, supported by simulations of systems with up to 1000 qubits. By alleviating constraints on qubit frequency bandwidth for parallel single-qubit operations, this work represents an important step for scaling towards larger quantum processors.
Cite
@article{arxiv.2603.11018,
title = {Mitigating crosstalk errors for simultaneous single-qubit gates on a superconducting quantum processor},
author = {Jaap J. Wesdorp and Eric Hyyppä and Joona Andersson and Janos Adam and Rohit Beriwal and Ville Bergholm and Saga Dahl and Simone Diego Fasciati and Alejandro Gomez Friero and Zheming Gao and Daria Gusenkova and Andrew Guthrie and Johannes Heinsoo and Tuukka Hiltunen and Keiran Holland and Amin Hosseinkhani and Sinan Inel and Joni Ikonen and Shan W. Jolin and Kristinn Juliusson and Seung-Goo Kim and Anton Komlev and Roope Kokkoniemi and Otto Koskinen and Joonas Kylmälä and Alessandro Landra and Julia Lamprich and Magdalena Lehmuskoski and Nizar Lethif and Per Liebermann and Tianyi Li and Aleksi Lintunen and Fabian Marxer and Kunal Mitra and Jakub Mrożek and Lucas Ortega and Miha Papič and Matti Partanen and Alexander Plyushch and Stefan Pogorzalek and Michael Renger and Jussi Ritvas and Sampo Saarinen and Indrajeet Sagar and Matthew Sarsby and Mykhailo Savytskyi and Ville Selinmaa and Ivan Takmakov and Brian Tarasinski and Francesca Tosto and David Vasey and Panu Vesanen and Jeroen Verjauw and Alpo Välimaa and Nicola Wurz and Hsiang-Sheng Ku and Frank Deppe and Juha Hassel and Caspar Ockeloen-Korppi and Wei Liu and Jani Tuorila and Chun Fai Chan and Attila Geresdi and Antti Vepsäläinen},
journal= {arXiv preprint arXiv:2603.11018},
year = {2026}
}
Comments
45 pages, 6 figures in the main text, 20 figures in the Appendices. Eric Hyypp\"a and Jaap J. Wesdorp contributed equally to this work