{
  "abstract": "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.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Physical Review Research (2026)",
  "arxiv": "2605.02755",
  "author_total": 4,
  "authors": [
    {
      "name": "J. Lisenfeld"
    },
    {
      "name": "A. K. Händel"
    },
    {
      "name": "A. Bilmes"
    },
    {
      "name": "A. V. Ustinov"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/dytq7hmakgpjj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.02755",
  "fulltext_url": null,
  "id": "dytq7hmakgpjj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.02755",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mes-hall"
    ],
    [
      "arxiv",
      "cond-mat.supr-con"
    ],
    [
      "arxiv",
      "quant-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2605.02755",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/dytq7hmakgpjj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:31Z",
      "native_id": "2605.02755",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.02755"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Readout failures in superconducting qubits due to TLS-defects in tunnel junctions",
  "title_text": "Readout failures in superconducting qubits due to TLS-defects in tunnel junctions",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:31Z",
  "url": "https://research.draconitic.com/paper/dytq7hmakgpjj",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1103/ypm5-lh8d",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}