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Violation of Bell Inequalities by Photons More Than 10 km Apart

Published inPhysical Review Letters, vol. 81, no. 17, p. 3563-3566
Publication date1998
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 two-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.

Citation (ISO format)
TITTEL, Wolfgang et al. Violation of Bell Inequalities by Photons More Than 10 km Apart. In: Physical Review Letters, 1998, vol. 81, n° 17, p. 3563–3566. doi: 10.1103/PhysRevLett.81.3563
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ISSN of the journal0031-9007
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