{
  "abstract": "Rapid reset and readout of qubit states are essential for quantum error correction, yet accelerating these operations through stronger coupling to a dissipative environment inevitably increases qubit decay via the Purcell effect. Here we present a broadband Purcell filter that decouples the reset and readout paths, enabling both operations to be independently optimized without compromising qubit coherence. The filter employs two engineered notches - an intrinsic notch and a bandstop notch - to provide broadband Purcell protection, together with an additional reset stub that creates a reset mode below the protected band. To enable fast reset while suppressing filter-mediated interactions between qubits, we couple each qubit to a dedicated reset resonator. We experimentally demonstrate Purcell-limited relaxation times exceeding 1 ms across a 1.2 GHz bandwidth, simultaneously with 500 ns readout without a Josephson parametric amplifier and 100 ns reset with 99.6% efficiency. The reset resonator is designed with a deliberate kappa-chi mismatch, which suppresses photon-shot-noise-induced dephasing by a factor of 70 compared to the readout resonator. Our work provides a scalable hardware solution that resolves the traditional trade-off between fast qubit operations and qubit protection, advancing the prospects for fault-tolerant quantum computing.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.14081",
  "author_total": 15,
  "authors": [
    {
      "name": "Yu Zhao"
    },
    {
      "name": "Zhixu Chen"
    },
    {
      "name": "Hanxian Liu"
    },
    {
      "name": "Mingze Liu"
    },
    {
      "name": "Zixing Liu"
    },
    {
      "name": "Hao Pang"
    },
    {
      "name": "Meiyan Wan"
    },
    {
      "name": "Changkun Wu"
    },
    {
      "name": "Liuzhu Zhong"
    },
    {
      "name": "Sai Li"
    },
    {
      "name": "Yuefeng Yuan"
    },
    {
      "name": "Yuxuan Zhou"
    },
    {
      "name": "Ji Jiang"
    },
    {
      "name": "Ji Chu"
    },
    {
      "name": "Song Liu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/94p0eyb655xxj.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.14081",
  "fulltext_url": null,
  "id": "94p0eyb655xxj",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.14081",
  "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": "W7213329953",
  "pdf_url": "https://arxiv.org/pdf/2609.14081",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-12",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/94p0eyb655xxj.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:25Z",
      "native_id": "2609.14081",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.14081"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Broadband Purcell Filter for Fast Superconducting Qubit Reset and Readout",
  "title_text": "Broadband Purcell Filter for Fast Superconducting Qubit Reset and Readout",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:25Z",
  "url": "https://research.draconitic.com/paper/94p0eyb655xxj",
  "venue": "arXiv",
  "versions": []
}