dorsal/arxiv
View SchemaPhoton-bunching measurement after 2x25km of standard optical fibers
| Authors | M. Halder, S. Tanzilli, H. de Riedmatten, A. Beveratos, H. Zbinden, N. Gisin |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0408092 |
| URL | https://arxiv.org/abs/quant-ph/0408092 |
| DOI | 10.1103/PhysRevA.71.042335 |
| Journal | Phys. Rev. A 71, 042335 (2005) |
Abstract
To show the feasibility of a long distance partial Bell-State measurement, a Hong-Ou-Mandel experiment with coherent photons is reported. Pairs of degenerate photons at telecom wavelength are created by parametric down conversion in a periodically poled lithium niobate waveguide. The photon pairs are separated in a beam-splitter and transmitted via two fibers of 25km. The wave-packets are relatively delayed and recombined on a second beam-splitter, forming a large Mach-Zehnder interferometer. Coincidence counts between the photons at the two output modes are registered. The main challenge consists in the trade-off between low count rates due to narrow filtering and length fluctuations of the 25km long arms during the measurement. For balanced paths a Hong-Ou-Mandel dip with a visibility of 47.3% is observed, which is close to the maximal theoretical value of 50% developed here. This proves the practicability of a long distance Bell state measurement with two independent sources, as e.g. required in an entanglement swapping configuration in the scale of tens of km.
{
"annotation_id": "bb5fe9b5-4401-4285-9518-dac35c0991fa",
"date_created": "2026-03-02T18:02:10.378000Z",
"date_modified": "2026-03-02T18:02:10.378000Z",
"file_hash": "89c8030e1a56583dce7566c6e5d5d4236c6aa7396e1424948644c03a9042eefe",
"private": false,
"record": {
"abstract": "To show the feasibility of a long distance partial Bell-State measurement, a\nHong-Ou-Mandel experiment with coherent photons is reported. Pairs of\ndegenerate photons at telecom wavelength are created by parametric down\nconversion in a periodically poled lithium niobate waveguide. The photon pairs\nare separated in a beam-splitter and transmitted via two fibers of 25km. The\nwave-packets are relatively delayed and recombined on a second beam-splitter,\nforming a large Mach-Zehnder interferometer. Coincidence counts between the\nphotons at the two output modes are registered. The main challenge consists in\nthe trade-off between low count rates due to narrow filtering and length\nfluctuations of the 25km long arms during the measurement. For balanced paths a\nHong-Ou-Mandel dip with a visibility of 47.3% is observed, which is close to\nthe maximal theoretical value of 50% developed here. This proves the\npracticability of a long distance Bell state measurement with two independent\nsources, as e.g. required in an entanglement swapping configuration in the\nscale of tens of km.",
"arxiv_id": "quant-ph/0408092",
"authors": [
"M. Halder",
"S. Tanzilli",
"H. de Riedmatten",
"A. Beveratos",
"H. Zbinden",
"N. Gisin"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevA.71.042335",
"journal_ref": "Phys. Rev. A 71, 042335 (2005)",
"title": "Photon-bunching measurement after 2x25km of standard optical fibers",
"url": "https://arxiv.org/abs/quant-ph/0408092"
},
"schema_id": "dorsal/arxiv",
"source": {
"execution_id": "d87ea6c0-717d-4644-ae3f-25a45f6eb81e",
"id": "arXiv Dataset IDs",
"type": "Model",
"variant": "snapshot-2026-03-01",
"version": "0.1.0"
},
"user_id": 1000002
}