{
  "abstract": "Continuous-variable quantum key distribution utilizes advanced digital signal processing techniques to mitigate channel impairments, driving the progress of high-performance quantum secure communications. Specifically, digital heterodyne receivers are commonly implemented using down-conversion algorithms to detect both components simultaneously where the signal is modulated onto an intermediate frequency to avoid low-frequency noise and bypass stringent optical phase-locking requirements. However, a rigorous analysis of the quantum security implications of the digital down-conversion algorithm remains absent. In this paper, we investigate the algorithm process from the perspective of quantum operator evolution, revealing that the frequency folding effect inherent in down-conversion inevitably mixes the image-frequency information into the baseband signal. To address this issue, we propose a novel operator reconstruction detection scheme based on dual-path digital heterodyne receiver. By performing a non-equal weighted combination of the output operators along two optical paths in the digital domain, this scheme perfectly cancels out the image-frequency operator physically. The robust receiver architecture preserves the baseband noise-suppression advantages, inherently achieves perfect mode balancing for asymmetric optical detection losses, and fundamentally closes the image-frequency crosstalk. Practical experiments have validated the feasibility of the proposed architecture and its effective suppression of image-frequency noise, achieving a performance of 11.4 Mbps @ 42 km. This work lays a solid theoretical and algorithmic foundation for future high-performance, highly secure digital continuous-variable quantum key distribution systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.13090",
  "author_total": 9,
  "authors": [
    {
      "name": "Lu Fan"
    },
    {
      "name": "Xuesong Xu"
    },
    {
      "name": "Miao Yu"
    },
    {
      "name": "Zhengyu Li"
    },
    {
      "name": "Yunsong Yin"
    },
    {
      "name": "Hao Shi"
    },
    {
      "name": "Xuanyu Guo"
    },
    {
      "name": "Song Yu"
    },
    {
      "name": "Yichen Zhang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/58tzsv6v6eb9m.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.13090",
  "fulltext_url": null,
  "id": "58tzsv6v6eb9m",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.13090",
  "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": "W7221522387",
  "pdf_url": "https://arxiv.org/pdf/2610.13090",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-09",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/58tzsv6v6eb9m.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:28:36Z",
      "native_id": "2610.13090",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.13090"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "A robust digital receiver architecture for continuous-variable quantum key distribution",
  "title_text": "A robust digital receiver architecture for continuous-variable quantum key distribution",
  "type": "preprint",
  "updated_at": "2026-10-30T12:28:36Z",
  "url": "https://research.draconitic.com/paper/58tzsv6v6eb9m",
  "venue": "arXiv",
  "versions": []
}