{
  "abstract": "Channel loss in long-distance phase-matching quantum key distribution (PM-QKD) amplifies vacuum emissions and dark counts, impairing parameter estimation and limiting secure transmission distance. In this paper, we propose a PM-QKD protocol based on heralded single-photon sources (HSPSs) with local detection. In the key sifting stage, local heralding outcomes are filtered to suppress vacuum-dominated noise and enhance the single-photon fraction of the retained ensemble. A three-intensity decoy-state method is used to estimate the single-photon contribution and bound the phase-error rate. An asymptotic security analysis is provided. Simulation results show that the proposed protocol surpasses the PLOB bound at $316\\,\\mathrm{km}$ and achieves a practical key rate of $10^{-8}$ at $496\\,\\mathrm{km}$, while the conventional PM-QKD protocol based on weak coherent sources reaches the same key rate only at $439\\,\\mathrm{km}$. These gains are mainly attributed to the vacuum-event filtering strategy, which effectively improves both key-rate performance and transmission distance. Furthermore, our evaluation of a practical threshold detector implementation demonstrates that photon-number-resolving (PNR) detectors are not mandatory to achieve this advantage.",
  "abstract_shown": true,
  "affiliations": [
    "Jinan University",
    "Shenzhen Polytechnic University"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Shiya Zeng",
      "orcid": "0009-0009-4292-8898"
    },
    {
      "affs": [
        0
      ],
      "name": "Ruobin Zhao"
    },
    {
      "affs": [
        0
      ],
      "name": "Junyan Luo"
    },
    {
      "affs": [
        1
      ],
      "name": "Zhiwei Sun",
      "orcid": "0009-0008-7846-4792"
    },
    {
      "affs": [
        0
      ],
      "name": "Tingting Song",
      "orcid": "0000-0003-4088-8641"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/d64r2rb89j0t9.bib",
  "cited_by": 0,
  "doi": "10.1088/1367-2630/aeb8b4",
  "fulltext_url": null,
  "id": "d64r2rb89j0t9",
  "issns": [
    "1367-2630"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.1088/1367-2630/aeb8b4",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "feed-journal",
      "physics/general"
    ],
    [
      "openalex",
      "1702|Quantum Information and Cryptography"
    ]
  ],
  "openalex": "W7223408595",
  "pdf_url": "https://iopscience.iop.org/article/10.1088/1367-2630/aeb8b4/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-23",
  "publisher": "IOP Publishing",
  "ris": "https://research.draconitic.com/paper/d64r2rb89j0t9.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:56Z",
      "native_id": "10.1088/1367-2630/aeb8b4",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.1088/1367-2630/aeb8b4"
    },
    {
      "first_seen": "2026-11-06T18:20:58Z",
      "native_id": "10.1088/1367-2630/aeb8b4",
      "source": "feed-iop",
      "url": "https://iopscience.iop.org/article/10.1088/1367-2630/aeb8b4"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "journal-openalex:3107|Quantum Mechanics and Applications",
      "subfield": "amo"
    }
  ],
  "title": "Phase-Matching Quantum Key Distribution with Heralded Single-Photon Sources and Local Detection",
  "title_text": "Phase-Matching Quantum Key Distribution with Heralded Single-Photon Sources and Local Detection",
  "type": "peer-reviewed",
  "updated_at": "2026-11-06T18:20:58Z",
  "url": "https://research.draconitic.com/paper/d64r2rb89j0t9",
  "venue": "New Journal of Physics",
  "versions": []
}