{
  "annotation_id": "2e966c22-d124-4b66-9114-f05531e630c1",
  "date_created": "2026-03-02T18:02:10Z",
  "date_modified": "2026-03-02T18:02:10Z",
  "file_hash": "01b8875f72eef7941df290335d2dab5394cdf741a612917f8355be5d70563bfd",
  "private": false,
  "record": {
    "abstract": "In this paper we have analysed in detail two different purification\nprotocols. The first one, proposed by Sudarshan, is based on the preservation\nof probabilities.We have constructed a second protocol here based on\noptimisation of fidelities. We have considered both complete and partial\nmeasurements and have established bounds and inequalities for various\nfidelities. For every type of measurement, we have analysed post-measurement\nstates based on the Maximum entropy principle as well as what we have proposed\nas unbiased states. We show that our purification protocol always leads to\nbetter state reconstruction. These schemes can be thought of as operations in\nthe sense of Kraus and we have explicitly constructed the Kraus operators for\nthese. We have also shown that the entropy either increases or remains the same\ndepending on the choice of the purification basis.",
    "arxiv_id": "quant-ph/0407156",
    "authors": [
      "Chirag Dhara",
      "N. D. Hari Dass"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Purifications Without Entanglement, State Reconstructions and Entropy",
    "url": "https://arxiv.org/abs/quant-ph/0407156"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2d821bb2-aa65-466d-b1b8-90d00e33f237",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}