{
  "abstract": "We present a unified study of charge and spin qubits encoded in a single interacting quantum dot tunnel-coupled to Rashba fermionic leads. The dot is described by an Anderson impurity Hamiltonian with either repulsive or attractive local interactions and a magnetic field of arbitrary orientation. In the repulsive regime, a spin qubit is encoded in the singly occupied spin sector, whereas in the attractive regime, close to the degeneracy between the empty and doubly occupied configurations, these two states define a charge-qubit subspace. We combine a weak-coupling Lindblad master equation in the Markovian secular limit with numerically controlled matrix-product-state simulations of the full dot-reservoir system. In equilibrium, we identify magnetic pair breaking in the attractive regime and a weak Rashba-induced magnetic anisotropy when the magnetic field is rotated relative to the spin-orbit axis. In the dynamical regime, relaxation and decoherence are controlled by the energetic gap between the logical manifold and nearby leakage states, and are further enhanced by Rashba-dependent tunneling. These findings show that even a minimal Anderson-impurity description captures key ingredients for coherent spin and charge qubits: the energetic structure of leakage states and spin-orbit-dependent dot-lead hybridization.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.27648",
  "author_total": 6,
  "authors": [
    {
      "name": "Grazia Di Bello"
    },
    {
      "name": "Fabrizio Pavan"
    },
    {
      "name": "Mattia Trama"
    },
    {
      "name": "Roberta Citro"
    },
    {
      "name": "Giulio De Filippis"
    },
    {
      "name": "Carmine Antonio Perroni"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/583rd6emy3y7p.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.27648",
  "fulltext_url": null,
  "id": "583rd6emy3y7p",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.27648",
  "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",
      "cond-mat.mes-hall"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "arxiv",
      "quant-ph"
    ],
    [
      "openalex",
      "3107|Quantum and electron transport phenomena"
    ]
  ],
  "openalex": "W7214230829",
  "pdf_url": "https://arxiv.org/pdf/2609.27648",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-23",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/583rd6emy3y7p.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:56Z",
      "native_id": "2609.27648",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.27648"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mes-hall",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Charge and spin qubits in interacting quantum dots coupled to Rashba-active leads",
  "title_text": "Charge and spin qubits in interacting quantum dots coupled to Rashba-active leads",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:56Z",
  "url": "https://research.draconitic.com/paper/583rd6emy3y7p",
  "venue": "arXiv",
  "versions": []
}