{
  "abstract": "The standard description of the state of a spin in quantum mechanics presupposes externally fixed directions -- a classical background. Can a spin be fully described instead in relation to other quantum mechanical systems? Poulin suggested twenty years ago group averaging over rotations the joint state of a fundamental spin and a reference spin with large angular momentum which, however, yields a classical bit in a probabilistic mixture. We revisit this idea and show that when the quantum reference system is augmented to \\emph{two} large spins, the standard quantum mechanical description of a spin is recovered in the limit of large quantum numbers for the reference system.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.15873",
  "author_total": 4,
  "authors": [
    {
      "name": "Hannah Troger"
    },
    {
      "name": "Ofek Bengyat"
    },
    {
      "name": "Thomas D. Galley"
    },
    {
      "name": "Marios Christodoulou"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/1p75j2884j5sx.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.15873",
  "fulltext_url": null,
  "id": "1p75j2884j5sx",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.15873",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "gr-qc"
    ],
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "3107|Quantum Mechanics and Applications"
    ]
  ],
  "openalex": "W7164958206",
  "pdf_url": "https://arxiv.org/pdf/2606.15873",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-20",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/1p75j2884j5sx.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:34:04Z",
      "native_id": "2606.15873",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.15873"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:gr-qc",
      "subfield": "gravitation"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Complete Relational Description of Spin in a Quantum Background",
  "title_text": "Complete Relational Description of Spin in a Quantum Background",
  "type": "preprint",
  "updated_at": "2026-10-30T12:34:04Z",
  "url": "https://research.draconitic.com/paper/1p75j2884j5sx",
  "venue": "arXiv",
  "versions": []
}