Violation of Bell inequalities by photons more than 10 km apart

Details Violation of Bell inequalities by photons more than 10 km apart Violation of Bell inequalities by photons more than 10 km apart

1998-06-12

arxiv.org/abs/quant-ph/9806043v1

Phys.Rev.Lett. 81 (1998) 3563-3566

Physics

Quantum Physics

4 pages, REVTeX, 2 postscript figures included

Scientific paper

10.1103/PhysRevLett.81.3563

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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