{
  "annotation_id": "9bba6798-9796-4cdd-8bfc-4467f5d7eeae",
  "date_created": "2026-03-02T18:01:46.028000Z",
  "date_modified": "2026-03-02T18:01:46.028000Z",
  "file_hash": "a9b55fe17b776c4e20b4604ab7c9fc7d4e8a37b29dc7bda726f40d1347812a83",
  "private": false,
  "record": {
    "abstract": "The well-known algorithm for quantum phase estimation requires that the\nconsidered unitary is available as a conditional transformation depending on\nthe quantum state of an ancilla register. We present an algorithm converting an\nunknown n-qubit pair-interaction Hamiltonian into a conditional one such that\nstandard phase estimation can be applied to measure the energy. Our essential\nassumption is that the considered system can be brought into interaction with a\nquantum computer. For large n the algorithm could still be applicable for\nestimating the density of energy states and might therefore be useful for\nfinding energy gaps in solid states.",
    "arxiv_id": "quant-ph/0108052",
    "authors": [
      "Dominik Janzing"
    ],
    "categories": [
      "quant-ph"
    ],
    "journal_ref": "Quant. Inf. \u0026 Comp. 2 (3):198-207, 2002",
    "title": "Quantum algorithm for measuring the energy of n qubits with unknown   pair-interactions",
    "url": "https://arxiv.org/abs/quant-ph/0108052"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "5bdc3f99-5c4e-4dee-953b-3b7236e82b51",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}