{
  "abstract": "We present a quantum-enhanced search for the Galactic dark-photon background (GDPB), a relativistic and anisotropic vector field that can be produced by dark-matter decay or annihilation in the Milky Way halo. We reinterpret an existing quantum-enhanced dark-photon dataset obtained with a superconducting circuit QED platform originally developed for wave-like dark-photon dark-matter searches, consisting of a high-$Q$ niobium cavity in the $\\mathrm{TM}_{010}$ mode dispersively coupled to a transmon qubit. By preparing four-component cat states and performing repeated quantum non-demolition parity measurements, analyzed with a hidden Markov model, we extract photon-transition probabilities for multiple cat amplitudes and integration times. The coupling to the GDPB is governed by a polarization- and angle-dependent cavity overlap function, which predicts a distinctive diurnal modulation of the excitation rate for both longitudinal and transverse polarizations. From the absence of such modulation, we set 90\\% confidence-level bounds on the kinetic-mixing parameter $ε$ for two benchmark production mechanisms (parametric and cascade decay) over the relativistic mass range $m_X \\ll ω_c$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.19751",
  "author_total": 7,
  "authors": [
    {
      "name": "Aoying Wang"
    },
    {
      "name": "Yanjie Zeng"
    },
    {
      "name": "Yanyan Cai"
    },
    {
      "name": "Jing Shu"
    },
    {
      "name": "Bin Xu"
    },
    {
      "name": "Yuan Xu"
    },
    {
      "name": "Pan Zheng"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/54jc7p3jfmz1c.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.19751",
  "fulltext_url": null,
  "id": "54jc7p3jfmz1c",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.19751",
  "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",
      "hep-ex"
    ],
    [
      "arxiv",
      "hep-ph"
    ],
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "3106|Dark Matter and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7222267501",
  "pdf_url": "https://arxiv.org/pdf/2610.19751",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-14",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/54jc7p3jfmz1c.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:31Z",
      "native_id": "2610.19751",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.19751"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:hep-ex",
      "subfield": "high-energy"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Quantum-enhanced Search for Galactic Dark Photons Using Cat-State Cavities",
  "title_text": "Quantum-enhanced Search for Galactic Dark Photons Using Cat-State Cavities",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:31Z",
  "url": "https://research.draconitic.com/paper/54jc7p3jfmz1c",
  "venue": "arXiv",
  "versions": []
}