{
  "abstract": "Consider a bipartite quantum system S=AB such that each part interacts only with its local environment. Under such circumstances, one expects that the entanglement between parts A and B does not increase after the time evolution. In fact, this is the case if the reduced dynamics of the system is given by $\\mathcal{E}_{A}\\otimes \\mathcal{E}_{B}$, where $\\mathcal{E}_{A}$ and $\\mathcal{E}_{B}$ are quantum channels, i.e., completely positive trace-preserving maps. But, the reduced dynamics of the system may be given by a map as $Ψ_{A}\\otimes Ψ_{B}$, where $Ψ_{A}$ and $Ψ_{B}$ are local non-positive maps. Then, the entanglement between A and B can exceed its initial value, as was shown in the case studied by Jordan et al. [Phys. Rev. A 76, 022102 (2007)]. In this paper, we first explore the general circumstances under which one can find such cases as they found. Next, we introduce another general procedure which leads to local non-positive maps that exhibit entanglement exceeding. Furthermore, we demonstrate that this apparent entanglement increase in the two above procedures corresponds physically to the retrieval of pre-existing inaccessible entanglement stored across the global system-environment degrees of freedom, rather than genuine generation of the entanglement $\\textit{ex nihilo}$.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Brazilian Journal of Physics (2026) 56:238",
  "arxiv": "2605.08923",
  "author_total": 1,
  "authors": [
    {
      "name": "Iman Sargolzahi"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4f6er2sbj0jky.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2605.08923",
  "fulltext_url": null,
  "id": "4f6er2sbj0jky",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2605.08923",
  "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/2605.08923",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-13",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/4f6er2sbj0jky.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:29:11Z",
      "native_id": "2605.08923",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2605.08923"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Entanglement recovering under local non-positive reduced dynamics",
  "title_text": "Entanglement recovering under local non-positive reduced dynamics",
  "type": "preprint",
  "updated_at": "2026-10-30T12:29:11Z",
  "url": "https://research.draconitic.com/paper/4f6er2sbj0jky",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1007/s13538-026-02153-0",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}