{
  "abstract": "Far-detuned frequency allocations in fixed-frequency superconducting processors mitigate spectral crowding but constrain cross-resonance interactions at practical drive amplitudes. Here, we demonstrate that a single strong drive induces a large $XX-YY$ interaction in the far-detuned regime, while a weak second tone tunes the accompanying $ZZ$ phase. The interaction realizes a 150-ns $\\sqrt{\\mathrm{bSWAP}}$ gate, which can directly prepare a maximally entangled state from the ground state. For the implementations on the same qubit pair at matched drive strengths, cross resonance gives a shorter CNOT operation, while $\\sqrt{\\mathrm{bSWAP}}$ gives a 33% shorter SWAP operation with a higher IRB fidelity. The multilevel theory further predicts a regime where stronger driving can yield a speed advantage for CNOT as well, a possibility absent in the two-level model. As an application of the $XX-YY$ interaction, we also demonstrate two-spin squeezing beyond the standard quantum limit through two-axis countertwisting. The interaction realized here complements cross resonance and offers a route to efficient gate synthesis and quantum simulation of interacting spin systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.21936",
  "author_total": 12,
  "authors": [
    {
      "name": "Akinori Machino"
    },
    {
      "name": "Kazuhisa Ogawa"
    },
    {
      "name": "Yuto Ikegai"
    },
    {
      "name": "Takafumi Miyanaga"
    },
    {
      "name": "Koichiro Ban"
    },
    {
      "name": "Nilton F. G. Filho"
    },
    {
      "name": "Hidehisa Shiomi"
    },
    {
      "name": "Toshi Sumida"
    },
    {
      "name": "Shuhei Tamate"
    },
    {
      "name": "Yutaka Tabuchi"
    },
    {
      "name": "Yasunobu Nakamura"
    },
    {
      "name": "Makoto Negoro"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/fbzw9n64axz9r.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.21936",
  "fulltext_url": null,
  "id": "fbzw9n64axz9r",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.21936",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "1702|Quantum Information and Cryptography"
    ]
  ],
  "openalex": "W7222489512",
  "pdf_url": "https://arxiv.org/pdf/2610.21936",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-15",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/fbzw9n64axz9r.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:50Z",
      "native_id": "2610.21936",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.21936"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "ZZ-Free bSWAP Gates under Strong Driving in Far-Detuned Fixed-Frequency Transmons",
  "title_text": "ZZ-Free bSWAP Gates under Strong Driving in Far-Detuned Fixed-Frequency Transmons",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:50Z",
  "url": "https://research.draconitic.com/paper/fbzw9n64axz9r",
  "venue": "arXiv",
  "versions": []
}