{
  "id": "2105.01392",
  "version": "v1",
  "published": "2021-05-04T10:01:19.000Z",
  "updated": "2021-05-04T10:01:19.000Z",
  "title": "Simultaneous operations in a two-dimensional array of singlet-triplet qubits",
  "authors": [
    "Federico Fedele",
    "Anasua Chatterjee",
    "Saeed Fallahi",
    "Geoffrey C. Gardner",
    "Michael J. Manfra",
    "Ferdinand Kuemmeth"
  ],
  "comment": "10 pages, 6 figures (including 2-page 2-figure supplement)",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "In many physical approaches to quantum computation, error-correction schemes assume the ability to form two-dimensional qubit arrays with nearest-neighbor couplings and parallel operations at multiple qubit sites. While semiconductor spin qubits exhibit long coherence times relative to their operation speed and single-qubit fidelities above error correction thresholds, multi-qubit operations in two-dimensional arrays have been limited by fabrication, operation, and readout challenges. We present a two-by-two array of four singlet-triplet qubits in gallium-arsenide and show simultaneous coherent operations and four-qubit measurements via exchange oscillations and frequency-multiplexed single-shot measurements. A larger multielectron quantum dot is fabricated in the center of the array as a tunable inter-qubit link, which we utilize to demonstrate coherent spin exchange with a qubit. Our techniques are extensible to other materials, indicating a path towards quantum processors with gate-controlled spin qubits.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-05-04T10:01:19.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "two-dimensional array",
      "singlet-triplet qubits",
      "simultaneous operations",
      "demonstrate coherent spin exchange",
      "larger multielectron quantum dot"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}