dorsal/arxiv
View SchemaQuantum process tomography of a controlled-NOT gate
| Authors | J. L. O'Brien, G. J. Pryde, A. Gilchrist, D. F. V. James, N. K. Langford, T. C. Ralph, A. G. White |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0402166 |
| URL | https://arxiv.org/abs/quant-ph/0402166 |
| DOI | 10.1103/PhysRevLett.93.080502 |
| Journal | Phys.Rev.Lett.93:080502,2004 |
Abstract
We demonstrate complete characterization of a two-qubit entangling process - a linear optics controlled-NOT gate operating with coincident detection - by quantum process tomography. We use maximum-likelihood estimation to convert the experimental data into a physical process matrix. The process matrix allows accurate prediction of the operation of the gate for arbitrary input states, and calculation of gate performance measures such as the average gate fidelity, average purity and entangling capability of our gate, which are 0.90, 0.83 and 0.73, respectively.
{
"annotation_id": "2537513b-0490-43fd-9700-c7b3b49b491c",
"date_created": "2026-03-02T18:02:07.126000Z",
"date_modified": "2026-03-02T18:02:07.126000Z",
"file_hash": "e1719e5b9f7f6e4c3201bfea5aba1a8796dc14a43633b67412a1bb149cc6cbea",
"private": false,
"record": {
"abstract": "We demonstrate complete characterization of a two-qubit entangling process -\na linear optics controlled-NOT gate operating with coincident detection - by\nquantum process tomography. We use maximum-likelihood estimation to convert the\nexperimental data into a physical process matrix. The process matrix allows\naccurate prediction of the operation of the gate for arbitrary input states,\nand calculation of gate performance measures such as the average gate fidelity,\naverage purity and entangling capability of our gate, which are 0.90, 0.83 and\n0.73, respectively.",
"arxiv_id": "quant-ph/0402166",
"authors": [
"J. L. O\u0027Brien",
"G. J. Pryde",
"A. Gilchrist",
"D. F. V. James",
"N. K. Langford",
"T. C. Ralph",
"A. G. White"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevLett.93.080502",
"journal_ref": "Phys.Rev.Lett.93:080502,2004",
"title": "Quantum process tomography of a controlled-NOT gate",
"url": "https://arxiv.org/abs/quant-ph/0402166"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "8d6c666f-99f0-4bfb-a778-fb24ee6ad746",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}