Readout failures in superconducting qubits due to TLS-defects in tunnel junctions
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866909012675526656 |
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| author | Lisenfeld, J. Händel, A. K. Bilmes, A. Ustinov, A. V. |
| author_facet | Lisenfeld, J. Händel, A. K. Bilmes, A. Ustinov, A. V. |
| contents | Material defects give rise to parasitic two-level systems (TLS) which present a major source of decoherence in superconducting qubits. Here, we study a strongly coupled TLS that resides in the tunnel barrier of transmon qubit. We use multi-photon spectroscopy and TLS strain tuning to explore the rich spectrum of the interacting three-partite system consisting of TLS, qubit, and its readout resonator. This reveals a strong effective resonant coupling between the TLS and the qubit's readout resonator which dresses the resonator states and results in a resonance frequency shift that spoils the readout signal. Our finding presents yet another way how material defects can interfere with qubit operation and hinder the realization of solid-state quantum processors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_02755 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Readout failures in superconducting qubits due to TLS-defects in tunnel junctions Lisenfeld, J. Händel, A. K. Bilmes, A. Ustinov, A. V. Quantum Physics Mesoscale and Nanoscale Physics Superconductivity Material defects give rise to parasitic two-level systems (TLS) which present a major source of decoherence in superconducting qubits. Here, we study a strongly coupled TLS that resides in the tunnel barrier of transmon qubit. We use multi-photon spectroscopy and TLS strain tuning to explore the rich spectrum of the interacting three-partite system consisting of TLS, qubit, and its readout resonator. This reveals a strong effective resonant coupling between the TLS and the qubit's readout resonator which dresses the resonator states and results in a resonance frequency shift that spoils the readout signal. Our finding presents yet another way how material defects can interfere with qubit operation and hinder the realization of solid-state quantum processors. |
| title | Readout failures in superconducting qubits due to TLS-defects in tunnel junctions |
| topic | Quantum Physics Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2605.02755 |