{
  "abstract": "When does a quantum particle arrive at a detector? The temporal distributions of itinerant quantum particles have been debated since the birth of quantum mechanics. Here we study the arrival-time problem in periodically monitored spin chains and quantum circuits. The arrival dynamics exhibits two regimes, the quantum Zeno and the low-monitoring regime, separated by an optimal monitoring period set by the single-particle bandwidth. In support of the theory, on superconducting quantum hardware, we measure arrival-time distributions for single and multiple interacting particles in one- and two-dimensional circuits. The measured distributions resolve both regimes and agree closely with quantum-trajectory theory. The crossover persists in interacting many-particle systems: the optimal monitoring point is preserved while many-body interference reshapes the distributions. Zeno suppression likewise persists in two-dimensional geometry. Together, these results show that the two regimes are a generic feature of monitored propagation rather than a single-particle effect. To our knowledge, our work constitutes the first experimental measurement of arrival-time distributions in a monitored quantum transport setting, addressing one of the longest-standing problems in quantum mechanics.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.09814",
  "author_total": 4,
  "authors": [
    {
      "name": "Yousef Mafi"
    },
    {
      "name": "K. G. S. H. Gunawardana"
    },
    {
      "name": "Kim Pöyhönen"
    },
    {
      "name": "Teemu Ojanen"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/at06acwzn6z7a.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.09814",
  "fulltext_url": null,
  "id": "at06acwzn6z7a",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.09814",
  "language": null,
  "licence": "CC-BY-NC-ND-4.0",
  "licence_label": "CC BY-NC-ND 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.stat-mech"
    ],
    [
      "arxiv",
      "cond-mat.str-el"
    ],
    [
      "arxiv",
      "quant-ph"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.09814",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-06",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/at06acwzn6z7a.ris",
  "sources": [
    {
      "first_seen": "2026-11-10T06:21:04Z",
      "native_id": "2611.09814",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.09814"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.str-el",
      "subfield": "condensed-matter"
    },
    {
      "field": "physics",
      "origin": "arxiv:quant-ph",
      "subfield": "quantum"
    },
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.stat-mech",
      "subfield": "statistical-nonlinear"
    }
  ],
  "title": "Arrival-time problem in the quantum information era - observation of a Zeno crossover in monitored arrival-time distributions",
  "title_text": "Arrival-time problem in the quantum information era - observation of a Zeno crossover in monitored arrival-time distributions",
  "type": "preprint",
  "updated_at": "2026-11-10T06:21:04Z",
  "url": "https://research.draconitic.com/paper/at06acwzn6z7a",
  "venue": "arXiv",
  "versions": []
}