{
  "abstract": "Entanglement distribution through optical fibers is essential for quantum communication networks; however, fiber transmission can alter photon polarization and modify the observed correlations of polarization-entangled states, necessitating polarization compensation to recover the desired entangled state in the measurement basis. Here, we experimentally evaluate two passive polarization compensation techniques: a free-space Quarter-Half-Quarter (QHQ) waveplate configuration and an in-fiber three-paddle Fiber Polarization Controller (FPC). The polarization transformation along each downconverted-photon path is independently compensated through a systematic path-by-path optimization procedure. Using both techniques, we recover high-quality polarization correlations and entanglement, with visibilities exceeding $93\\%$ in three mutually unbiased bases and fidelities above $94.5\\%$. The results demonstrate comparable restoration using free-space waveplate-based and fiber-based control, establishing a systematic framework for laboratory and short-reach quantum communication links.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.02554",
  "author_total": 4,
  "authors": [
    {
      "name": "Gayatri Thik"
    },
    {
      "name": "Amit Loyal"
    },
    {
      "name": "Srinivasan K"
    },
    {
      "name": "Raghavan G"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9zm30jt0zy9pm.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.02554",
  "fulltext_url": null,
  "id": "9zm30jt0zy9pm",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.02554",
  "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": "W7207609926",
  "pdf_url": "https://arxiv.org/pdf/2609.02554",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9zm30jt0zy9pm.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:16Z",
      "native_id": "2609.02554",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.02554"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Experimental Evaluation of Passive Polarization Compensation Techniques for Fiber-Distributed Polarization-Entangled Photons",
  "title_text": "Experimental Evaluation of Passive Polarization Compensation Techniques for Fiber-Distributed Polarization-Entangled Photons",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:16Z",
  "url": "https://research.draconitic.com/paper/9zm30jt0zy9pm",
  "venue": "arXiv",
  "versions": []
}