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Get Free AccessA 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.
Wolfgang Tittel, J. Brendel, Hugo Zbinden, Nicolas Gisin (1998). Violation of Bell Inequalities by Photons More Than 10 km Apart. Physical Review Letters, 81(17), pp. 3563-3566, DOI: 10.1103/physrevlett.81.3563.
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Type
Article
Year
1998
Authors
4
Datasets
0
Total Files
0
Language
English
Journal
Physical Review Letters
DOI
10.1103/physrevlett.81.3563
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