Mitigating crosstalk errors for simultaneous single-qubit gates on a superconducting quantum processor
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arXiv
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| Format: | Preprint |
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2026
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| author | Wesdorp, Jaap J. Hyyppä, Eric Andersson, Joona Adam, Janos Beriwal, Rohit Bergholm, Ville Dahl, Saga Fasciati, Simone Diego Friero, Alejandro Gomez Gao, Zheming Gusenkova, Daria Guthrie, Andrew Heinsoo, Johannes Hiltunen, Tuukka Holland, Keiran Hosseinkhani, Amin Inel, Sinan Ikonen, Joni Jolin, Shan W. Juliusson, Kristinn Kim, Seung-Goo Komlev, Anton Kokkoniemi, Roope Koskinen, Otto Kylmälä, Joonas Landra, Alessandro Lamprich, Julia Lehmuskoski, Magdalena Lethif, Nizar Liebermann, Per Li, Tianyi Lintunen, Aleksi Marxer, Fabian Mitra, Kunal Mrożek, Jakub Ortega, Lucas Papič, Miha Partanen, Matti Plyushch, Alexander Pogorzalek, Stefan Renger, Michael Ritvas, Jussi Saarinen, Sampo Sagar, Indrajeet Sarsby, Matthew Savytskyi, Mykhailo Selinmaa, Ville Takmakov, Ivan Tarasinski, Brian Tosto, Francesca Vasey, David Vesanen, Panu Verjauw, Jeroen Välimaa, Alpo Wurz, Nicola Ku, Hsiang-Sheng Deppe, Frank Hassel, Juha Ockeloen-Korppi, Caspar Liu, Wei Tuorila, Jani Chan, Chun Fai Geresdi, Attila Vepsäläinen, Antti |
| author_facet | Wesdorp, Jaap J. Hyyppä, Eric Andersson, Joona Adam, Janos Beriwal, Rohit Bergholm, Ville Dahl, Saga Fasciati, Simone Diego Friero, Alejandro Gomez Gao, Zheming Gusenkova, Daria Guthrie, Andrew Heinsoo, Johannes Hiltunen, Tuukka Holland, Keiran Hosseinkhani, Amin Inel, Sinan Ikonen, Joni Jolin, Shan W. Juliusson, Kristinn Kim, Seung-Goo Komlev, Anton Kokkoniemi, Roope Koskinen, Otto Kylmälä, Joonas Landra, Alessandro Lamprich, Julia Lehmuskoski, Magdalena Lethif, Nizar Liebermann, Per Li, Tianyi Lintunen, Aleksi Marxer, Fabian Mitra, Kunal Mrożek, Jakub Ortega, Lucas Papič, Miha Partanen, Matti Plyushch, Alexander Pogorzalek, Stefan Renger, Michael Ritvas, Jussi Saarinen, Sampo Sagar, Indrajeet Sarsby, Matthew Savytskyi, Mykhailo Selinmaa, Ville Takmakov, Ivan Tarasinski, Brian Tosto, Francesca Vasey, David Vesanen, Panu Verjauw, Jeroen Välimaa, Alpo Wurz, Nicola Ku, Hsiang-Sheng Deppe, Frank Hassel, Juha Ockeloen-Korppi, Caspar Liu, Wei Tuorila, Jani Chan, Chun Fai Geresdi, Attila Vepsäläinen, Antti |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_11018 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Mitigating crosstalk errors for simultaneous single-qubit gates on a superconducting quantum processor Wesdorp, Jaap J. Hyyppä, Eric Andersson, Joona Adam, Janos Beriwal, Rohit Bergholm, Ville Dahl, Saga Fasciati, Simone Diego Friero, Alejandro Gomez Gao, Zheming Gusenkova, Daria Guthrie, Andrew Heinsoo, Johannes Hiltunen, Tuukka Holland, Keiran Hosseinkhani, Amin Inel, Sinan Ikonen, Joni Jolin, Shan W. Juliusson, Kristinn Kim, Seung-Goo Komlev, Anton Kokkoniemi, Roope Koskinen, Otto Kylmälä, Joonas Landra, Alessandro Lamprich, Julia Lehmuskoski, Magdalena Lethif, Nizar Liebermann, Per Li, Tianyi Lintunen, Aleksi Marxer, Fabian Mitra, Kunal Mrożek, Jakub Ortega, Lucas Papič, Miha Partanen, Matti Plyushch, Alexander Pogorzalek, Stefan Renger, Michael Ritvas, Jussi Saarinen, Sampo Sagar, Indrajeet Sarsby, Matthew Savytskyi, Mykhailo Selinmaa, Ville Takmakov, Ivan Tarasinski, Brian Tosto, Francesca Vasey, David Vesanen, Panu Verjauw, Jeroen Välimaa, Alpo Wurz, Nicola Ku, Hsiang-Sheng Deppe, Frank Hassel, Juha Ockeloen-Korppi, Caspar Liu, Wei Tuorila, Jani Chan, Chun Fai Geresdi, Attila Vepsäläinen, Antti Quantum Physics 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. |
| title | Mitigating crosstalk errors for simultaneous single-qubit gates on a superconducting quantum processor |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2603.11018 |