dorsal/arxiv
View SchemaViolation of Bell inequalities by photons more than 10 km apart
| Authors | W. Tittel, J. Brendel, H. Zbinden, N. Gisin |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/9806043 |
| URL | https://arxiv.org/abs/quant-ph/9806043 |
| DOI | 10.1103/PhysRevLett.81.3563 |
| Journal | Phys.Rev.Lett. 81 (1998) 3563-3566 |
Abstract
A Franson-type test of Bell inequalities by photons 10.9 km apart is presented. Energy-time entangled photon-pairs are measured using two-channel analyzers, leading to a violation of the inequalities by 16 standard deviations without subtracting accidental coincidences. Subtracting them, a 2-photon interference visibility of 95.5% is observed, demonstrating that distances up to 10 km have no significant effect on entanglement. This sets quantum cryptography with photon pairs as a practical competitor to the schemes based on weak pulses.
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"abstract": "A Franson-type test of Bell inequalities by photons 10.9 km apart is\npresented. Energy-time entangled photon-pairs are measured using two-channel\nanalyzers, leading to a violation of the inequalities by 16 standard deviations\nwithout subtracting accidental coincidences. Subtracting them, a 2-photon\ninterference visibility of 95.5% is observed, demonstrating that distances up\nto 10 km have no significant effect on entanglement. This sets quantum\ncryptography with photon pairs as a practical competitor to the schemes based\non weak pulses.",
"arxiv_id": "quant-ph/9806043",
"authors": [
"W. Tittel",
"J. Brendel",
"H. Zbinden",
"N. Gisin"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevLett.81.3563",
"journal_ref": "Phys.Rev.Lett. 81 (1998) 3563-3566",
"title": "Violation of Bell inequalities by photons more than 10 km apart",
"url": "https://arxiv.org/abs/quant-ph/9806043"
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