{
  "annotation_id": "7abc0775-d76d-4550-bb24-e41a1b4ceea3",
  "date_created": "2026-03-02T18:02:27.287000Z",
  "date_modified": "2026-03-02T18:02:27.287000Z",
  "file_hash": "896d3a230fcf8d3327b0ecc4565d4cb24361b33746f0c2a7c66857a212c7e16c",
  "private": false,
  "record": {
    "abstract": "Recent theoretical and experimental papers have shown how one can achieve\nHeisenberg limited measurements by using entangled photons. Here we show how\nthe photons in non-collinear down conversion process can be used for improving\nthe sensitivity of magneto-optical rotation by a factor of four which takes us\ntowards the Heisenberg limit. Our results apply to sources with arbitrary\npumping. We also present several generalizations of earlier results for the\ncollinear geometry. The sensitivity depends on whether the two-photon or\nfour-photon coincidence detection is used.",
    "arxiv_id": "quant-ph/0605002",
    "authors": [
      "Aziz Kolkiran",
      "G. S. Agarwal"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.74.053810",
    "journal_ref": "Phys. Rev. A 74, 053810 (2006)",
    "title": "Towards Heisenberg Limit in Magnetometry with Parametric Down Converted   Photons",
    "url": "https://arxiv.org/abs/quant-ph/0605002"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b0ffe519-bf56-4f4a-87a5-e1d9c04dcaf0",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}