{
  "abstract": "We prove the security of phase-encoded decoy-state BB84 quantum key distribution for a Mach-Zehnder receiver with imbalanced beam splitters and two threshold detectors that leak fine-grained information about the detection patterns. For this, we derive a lower bound on Bob's single-photon contributions and combine it with the decoy-state method and a recent phase-error framework for leaky receivers. The leakage-induced correction to the phase-error rate is independent of channel loss, providing a loss-tolerant treatment of receiver leakage even in the presence of beam-splitter imbalance. Our results provide a practical route toward loss-tolerant security proofs for imperfect QKD receivers in the presence of receiver leakage.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.04539",
  "author_total": 4,
  "authors": [
    {
      "name": "Ryohei Mizusawa"
    },
    {
      "name": "Álvaro Navarrete"
    },
    {
      "name": "Akihiro Mizutani"
    },
    {
      "name": "Kiyoshi Tamaki"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bpykbcjakzhhe.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.04539",
  "fulltext_url": null,
  "id": "bpykbcjakzhhe",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.04539",
  "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/2611.04539",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bpykbcjakzhhe.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T15:21:25Z",
      "native_id": "2611.04539",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.04539"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Decoy-state quantum key distribution with a leaky Mach-Zehnder receiver",
  "title_text": "Decoy-state quantum key distribution with a leaky Mach-Zehnder receiver",
  "type": "preprint",
  "updated_at": "2026-11-04T15:21:25Z",
  "url": "https://research.draconitic.com/paper/bpykbcjakzhhe",
  "venue": "arXiv",
  "versions": []
}