Ultrastrong Coupling and Coherent Dynamics in a Gate-Tunable Transmon Qubit
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arXiv
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| Autores principales: | , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| author | Iglesias, I. Casal Matute-Cañadas, F. J. Steffensen, G. O. Ibabe, A. Splitthoff, L. Kanne, T. Nygard, J. Rollano, V. Granados, D. Gomez, A. Aguado, R. Yeyati, A. Levy Lee, E. J. H. |
| author_facet | Iglesias, I. Casal Matute-Cañadas, F. J. Steffensen, G. O. Ibabe, A. Splitthoff, L. Kanne, T. Nygard, J. Rollano, V. Granados, D. Gomez, A. Aguado, R. Yeyati, A. Levy Lee, E. J. H. |
| contents | Ultrastrong light-matter coupling (USC) gives access to exotic quantum phenomena and promises faster quantum gates, yet coherent time-domain control in this regime remains largely unexplored. Here, we realize USC in a hybrid system consisting of an InAs nanowire-based gatemon qubit coupled to a superconducting resonator. Spectroscopy reveals an avoided crossing that cannot be captured by the Jaynes-Cummings (JC) model, as well as photon-number-dependent transitions whose energies deviate markedly from the JC ladder expected in the strong coupling regime. Beyond demonstrating USC, we achieve time-resolved coherent control of the qubit and measure coherence times comparable to gatemons operating outside the USC regime. These results establish that hybrid semiconductor-superconductor qubits can retain coherent control in USC and provide a platform for exploring quantum dynamics and device concepts in this regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_19438 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultrastrong Coupling and Coherent Dynamics in a Gate-Tunable Transmon Qubit Iglesias, I. Casal Matute-Cañadas, F. J. Steffensen, G. O. Ibabe, A. Splitthoff, L. Kanne, T. Nygard, J. Rollano, V. Granados, D. Gomez, A. Aguado, R. Yeyati, A. Levy Lee, E. J. H. Mesoscale and Nanoscale Physics Superconductivity Quantum Physics Ultrastrong light-matter coupling (USC) gives access to exotic quantum phenomena and promises faster quantum gates, yet coherent time-domain control in this regime remains largely unexplored. Here, we realize USC in a hybrid system consisting of an InAs nanowire-based gatemon qubit coupled to a superconducting resonator. Spectroscopy reveals an avoided crossing that cannot be captured by the Jaynes-Cummings (JC) model, as well as photon-number-dependent transitions whose energies deviate markedly from the JC ladder expected in the strong coupling regime. Beyond demonstrating USC, we achieve time-resolved coherent control of the qubit and measure coherence times comparable to gatemons operating outside the USC regime. These results establish that hybrid semiconductor-superconductor qubits can retain coherent control in USC and provide a platform for exploring quantum dynamics and device concepts in this regime. |
| title | Ultrastrong Coupling and Coherent Dynamics in a Gate-Tunable Transmon Qubit |
| topic | Mesoscale and Nanoscale Physics Superconductivity Quantum Physics |
| url | https://arxiv.org/abs/2603.19438 |