{
  "abstract": "Unitary process tomography is the act of learning how an unknown unitary gate acts on a quantum system. It is an essential procedure for realizing a functioning quantum computer. As quantum technologies develop, it is important to understand the computational resources needed to conduct unitary process tomography using a variety of types of circuits. In particular, when measuring error in diamond distance, it is known how to achieve optimal query complexity using a sequential circuit architecture, but it had not been known whether a parallel circuit architecture could achieve the same optimal query complexity. In this work, we prove that unitary process tomography with near-optimal query complexity is indeed possible using a parallel circuit by introducing an explicit, novel parallel procedure. This closes the gap between sequential and parallel circuits up to a logarithmic factor, showing that parallel and sequential strategies are nearly equally capable for this task.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.36127",
  "author_total": 2,
  "authors": [
    {
      "name": "Noam Scully"
    },
    {
      "name": "Sisi Zhou"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/bnzbtwm079yw1.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.36127",
  "fulltext_url": null,
  "id": "bnzbtwm079yw1",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.36127",
  "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 Computing Algorithms and Architecture"
    ]
  ],
  "openalex": "W7214964383",
  "pdf_url": "https://arxiv.org/pdf/2609.36127",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/bnzbtwm079yw1.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:25:31Z",
      "native_id": "2609.36127",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.36127"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    }
  ],
  "title": "Near-Optimal Parallel Unitary Process Tomography in Diamond Distance",
  "title_text": "Near-Optimal Parallel Unitary Process Tomography in Diamond Distance",
  "type": "preprint",
  "updated_at": "2026-10-30T12:25:31Z",
  "url": "https://research.draconitic.com/paper/bnzbtwm079yw1",
  "venue": "arXiv",
  "versions": []
}