dorsal/arxiv
View SchemaMeasuring a photonic qubit without destroying it
| Authors | G. J. Pryde, J. L. O'Brien, A. G. White, S. D. Bartlett, T. C. Ralph |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0312048 |
| URL | https://arxiv.org/abs/quant-ph/0312048 |
| DOI | 10.1103/PhysRevLett.92.190402 |
| Journal | Phys.Rev.Lett.92:190402,2004 |
Abstract
Measuring the polarisation of a single photon typically results in its destruction. We propose, demonstrate, and completely characterise a \emph{quantum non-demolition} (QND) scheme for realising such a measurement non-destructively. This scheme uses only linear optics and photo-detection of ancillary modes to induce a strong non-linearity at the single photon level, non-deterministically. We vary this QND measurement continuously into the weak regime, and use it to perform a non-destructive test of complementarity in quantum mechanics. Our scheme realises the most advanced general measurement of a qubit: it is non-destructive, can be made in any basis, and with arbitrary strength.
{
"annotation_id": "f93b925d-b8d6-4311-8542-ada40d097e12",
"date_created": "2026-03-02T18:02:03.427000Z",
"date_modified": "2026-03-02T18:02:03.427000Z",
"file_hash": "cbc47e9f81569a35c53c297feea7d0be34b39b24b8a13284acdf2939f25a1dd4",
"private": false,
"record": {
"abstract": "Measuring the polarisation of a single photon typically results in its\ndestruction. We propose, demonstrate, and completely characterise a\n\\emph{quantum non-demolition} (QND) scheme for realising such a measurement\nnon-destructively. This scheme uses only linear optics and photo-detection of\nancillary modes to induce a strong non-linearity at the single photon level,\nnon-deterministically. We vary this QND measurement continuously into the weak\nregime, and use it to perform a non-destructive test of complementarity in\nquantum mechanics. Our scheme realises the most advanced general measurement of\na qubit: it is non-destructive, can be made in any basis, and with arbitrary\nstrength.",
"arxiv_id": "quant-ph/0312048",
"authors": [
"G. J. Pryde",
"J. L. O\u0027Brien",
"A. G. White",
"S. D. Bartlett",
"T. C. Ralph"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevLett.92.190402",
"journal_ref": "Phys.Rev.Lett.92:190402,2004",
"title": "Measuring a photonic qubit without destroying it",
"url": "https://arxiv.org/abs/quant-ph/0312048"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "9b429a8f-7a55-4646-9026-f92d9a1d373b",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}