dorsal/arxiv
View SchemaAncilla-assisted quantum process tomography
| Authors | J. B. Altepeter, D. Branning, E. Jeffrey, T. C. Wei, P. G. Kwiat, R. T. Thew, J. L. O'Brien, M. A. Nielsen, A. G. White |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0303038 |
| URL | https://arxiv.org/abs/quant-ph/0303038 |
| DOI | 10.1103/PhysRevLett.90.193601 |
| Journal | Physical Review Letters 90, 193601 (2003) |
Abstract
Complete and precise characterization of a quantum dynamical process can be achieved via the method of quantum process tomography. Using a source of correlated photons, we have implemented several methods investigating a wide range of processes, e.g., unitary, decohering, and polarizing. One of these methods, ancilla-assisted process tomography (AAPT), makes use of an additional ``ancilla system,'' and we have theoretically determined the conditions when AAPT is possible. All prior schemes for AAPT make use of entangled states. Our results show that, surprisingly, entanglement is not required for AAPT, and we present process tomography data obtained using an input state that has no entanglement. However, the use of entanglement yields superior results.
{
"annotation_id": "59a7743c-6b42-4b8e-b873-cb2271ccfc6a",
"date_created": "2026-03-02T18:01:56.266000Z",
"date_modified": "2026-03-02T18:01:56.266000Z",
"file_hash": "218c981c685e47258c977740b40177adfa5b6e912b247c91714f4b1d66e699dc",
"private": false,
"record": {
"abstract": "Complete and precise characterization of a quantum dynamical process can be\nachieved via the method of quantum process tomography. Using a source of\ncorrelated photons, we have implemented several methods investigating a wide\nrange of processes, e.g., unitary, decohering, and polarizing. One of these\nmethods, ancilla-assisted process tomography (AAPT), makes use of an additional\n``ancilla system,\u0027\u0027 and we have theoretically determined the conditions when\nAAPT is possible. All prior schemes for AAPT make use of entangled states. Our\nresults show that, surprisingly, entanglement is not required for AAPT, and we\npresent process tomography data obtained using an input state that has no\nentanglement. However, the use of entanglement yields superior results.",
"arxiv_id": "quant-ph/0303038",
"authors": [
"J. B. Altepeter",
"D. Branning",
"E. Jeffrey",
"T. C. Wei",
"P. G. Kwiat",
"R. T. Thew",
"J. L. O\u0027Brien",
"M. A. Nielsen",
"A. G. White"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevLett.90.193601",
"journal_ref": "Physical Review Letters 90, 193601 (2003)",
"title": "Ancilla-assisted quantum process tomography",
"url": "https://arxiv.org/abs/quant-ph/0303038"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "d11dadf9-c7a0-4b0e-87b8-f7781c931c58",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}