{
  "abstract": "Quantum key distribution (QKD) provides information-theoretic security independent of computational assumptions, yet the bulk and cost of current systems hinder large-scale deployment. Although integrated photonic technologies have enabled highly integrated QKD chips, practical QKD transmitters are still predominantly implemented as rack-mounted systems. Here, we demonstrate a highly integrated standalone QKD transmitter that integrates all essential functionalities required for practical QKD operation within a compact platform built around a silicon photonic encoding chip. The transmitter occupies only $167 \\times 56 \\times 21~\\mathrm{mm}^3$ ($\\sim 0.2~\\mathrm{dm}^3$), comparable in size to a half-height, half-width PCIe card and more than 30 times smaller in volume than a conventional 1U rack-mounted system. Paired with a conventional discrete-component receiver, it achieves a secure key rate of 219.1 kbps over 51.3 km of standard single-mode fiber, with performance comparable to that of conventional discrete-component implementations. This work bridges the gap between photonic chip integration and deployable QKD hardware, marking an important step toward transitioning QKD transmitters from conventional rack-mounted equipment to compact board-level platforms.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2607.23413",
  "author_total": 10,
  "authors": [
    {
      "name": "Rende Liu"
    },
    {
      "name": "Yan-Lin Tang"
    },
    {
      "name": "Cheng-Guang Dong"
    },
    {
      "name": "Yan Ma"
    },
    {
      "name": "Guo-Qing Liu"
    },
    {
      "name": "Zhi-Lin Xie"
    },
    {
      "name": "Shuai Li"
    },
    {
      "name": "Mi Zou"
    },
    {
      "name": "Hao Liang"
    },
    {
      "name": "Shi-biao Tang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/c7bvc9nc3595h.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2607.23413",
  "fulltext_url": null,
  "id": "c7bvc9nc3595h",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2607.23413",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2607.23413",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/c7bvc9nc3595h.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:18Z",
      "native_id": "2607.23413",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2607.23413"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Highly integrated quantum key distribution transmitter enabled by silicon photonics",
  "title_text": "Highly integrated quantum key distribution transmitter enabled by silicon photonics",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:18Z",
  "url": "https://research.draconitic.com/paper/c7bvc9nc3595h",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1109/jlt.2026.3746548",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}