{
  "annotation_id": "e7924f9b-e3a2-42cf-bfff-dc8f86e56d07",
  "date_created": "2026-03-02T18:01:42.319000Z",
  "date_modified": "2026-03-02T18:01:42.319000Z",
  "file_hash": "7b1ae67e64eed96d6fb0953515058f6214dcd2bddc80a93d22812034c30d5924",
  "private": false,
  "record": {
    "abstract": "We believe that the best chance to observe macroscopic quantum coherence\n(MQC) in a rf-SQUID qubit is to use on-chip RSFQ digital circuits for\npreparing, evolving and reading out the qubit\u0027s quantum state. This approach\nallows experiments to be conducted on a very short time scale (sub-nanosecond)\nwithout the use of large bandwidth control lines that would couple\nenvironmental degrees of freedom to the qubit thus contributing to its\ndecoherence. In this paper we present our design of a RSFQ digital control\ncircuit for demonstrating MQC in a rf-SQUID. We assess some of the key\npractical issues in the circuit design including the achievement of the\nnecessary flux bias stability. We present an \"active\" isolation structure to be\nused to increase coherence times. The structure decouples the SQUID from\nexternal degrees of freedom, and then couples it to the output measurement\ncircuitry when required, all under the active control of RSFQ circuits.\nResearch supported in part by ARO grant # DAAG55-98-1-0367.",
    "arxiv_id": "quant-ph/0102089",
    "authors": [
      "Roberto C. Rey-de-Castro",
      "Mark F. Bocko",
      "Andrea M. Herr",
      "Cesar A. Mancini",
      "Marc J. Feldman"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1109/77.919521",
    "title": "Design of an RSFQ Control Circuit to Observe MQC on an rf-SQUID",
    "url": "https://arxiv.org/abs/quant-ph/0102089"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "11d8645d-2c52-4df5-86a2-546616ff457b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}