{
  "annotation_id": "bfb47259-151b-4bc3-8ae3-c42dcabe6dd1",
  "date_created": "2026-03-02T18:01:49.513000Z",
  "date_modified": "2026-03-02T18:01:49.513000Z",
  "file_hash": "5380e8e2eecd9aaf962ee536c7dfbb600215aeeec7d50e5d0b0bfa72468ff1b0",
  "private": false,
  "record": {
    "abstract": "Usually models for quantum computations deal with unitary gates on pure\nstates. In this paper we generalize the usual model. We consider a model of\nquantum computations in which the state is an operator of density matrix and\nthe gates are quantum operations, not necessarily unitary. A mixed state\n(operator of density matrix) of n two-level quantum systems is considered as an\nelement of $4^{n}$-dimensional operator Hilbert space. Unitary quantum gates\nand nonunitary quantum operations for n-qubit system are considered as\ngeneralized quantum gates acting on mixed state. In this paper we study\nuniversality for quantum computations by quantum operations on mixed states.",
    "arxiv_id": "quant-ph/0201033",
    "authors": [
      "Vasily E. Tarasov"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Quantum Computation by Quantum Operations on Mixed States",
    "url": "https://arxiv.org/abs/quant-ph/0201033"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "fc0624da-e826-44bf-8466-391a30004285",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}