{
  "id": "2106.05881",
  "version": "v1",
  "published": "2021-06-10T16:08:50.000Z",
  "updated": "2021-06-10T16:08:50.000Z",
  "title": "Observation of measurement-induced quantum phases in a trapped-ion quantum computer",
  "authors": [
    "Crystal Noel",
    "Pradeep Niroula",
    "Andrew Risinger",
    "Laird Egan",
    "Debopriyo Biswas",
    "Marko Cetina",
    "Alexey V. Gorshkov",
    "Michael Gullans",
    "David A. Huse",
    "Christopher Monroe"
  ],
  "comment": "17 pages, 8 figures",
  "categories": [
    "quant-ph"
  ],
  "abstract": "Many-body open quantum systems balance internal dynamics against decoherence from interactions with an environment. Here, we explore this balance via random quantum circuits implemented on a trapped ion quantum computer, where the system evolution is represented by unitary gates with interspersed projective measurements. As the measurement rate is varied, a purification phase transition is predicted to emerge at a critical point akin to a fault-tolerent threshold. We probe the \"pure\" phase, where the system is rapidly projected to a deterministic state conditioned on the measurement outcomes, and the \"mixed\" or \"coding\" phase, where the initial state becomes partially encoded into a quantum error correcting codespace. We find convincing evidence of the two phases and show numerically that, with modest system scaling, critical properties of the transition clearly emerge.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-06-10T16:08:50.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "trapped-ion quantum computer",
      "measurement-induced quantum phases",
      "quantum systems balance internal dynamics",
      "many-body open quantum systems balance",
      "open quantum systems balance internal"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 17,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}