{
  "abstract": "Tunable couplers have enabled two-qubit gate fidelities in superconducting quantum processors to approach $99.9\\%$, yet simultaneously suppressing residual interactions and maintaining flexible qubit-frequency allocation remain central challenges for scaling. Here, we propose a double-resonator coupler (DRC) consisting of two resonators interconnected by a single Josephson junction and a capacitor. The hybridized resonator modes provide two mediated exchange paths whose interference controls the qubit-qubit interaction. The DRC enables complete cancellation of residual $ZZ$ interaction for qubit-qubit detunings well outside the straddling regime, even in the absence of direct qubit-qubit coupling, thereby relaxing constraints on frequency allocation and qubit placement. Away from the idle point, the same circuit provides a strong $ZZ$ interaction of approximately $70\\,\\mathrm{MHz}$, enabling a $20\\,\\mathrm{ns}$ controlled-Z gate with simulated coherent infidelity below $10^{-5}$. These results establish the DRC as a flexible single-junction coupler architecture for high-fidelity superconducting quantum processors.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.05222",
  "author_total": 9,
  "authors": [
    {
      "name": "Seunghyeon Jin"
    },
    {
      "name": "Seungha Woo"
    },
    {
      "name": "Shinyoung Hwang"
    },
    {
      "name": "June-Young M. Lee"
    },
    {
      "name": "Jeongmin Shim"
    },
    {
      "name": "Sunje Kim"
    },
    {
      "name": "Dae Seok Han"
    },
    {
      "name": "Jaeho Shin"
    },
    {
      "name": "Eunjong Kim"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/aref4xsqwn0cj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.05222",
  "fulltext_url": null,
  "id": "aref4xsqwn0cj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.05222",
  "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",
      "quant-ph"
    ],
    [
      "openalex",
      "1702|Quantum Information and Cryptography"
    ]
  ],
  "openalex": "W7211899689",
  "pdf_url": "https://arxiv.org/pdf/2609.05222",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/aref4xsqwn0cj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:12Z",
      "native_id": "2609.05222",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.05222"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "A double-resonator coupler for high-fidelity two-qubit gates between superconducting qubits",
  "title_text": "A double-resonator coupler for high-fidelity two-qubit gates between superconducting qubits",
  "type": "preprint",
  "updated_at": "2026-11-06T18:21:01Z",
  "url": "https://research.draconitic.com/paper/aref4xsqwn0cj",
  "venue": "arXiv",
  "versions": []
}