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Violation of Bell inequalities by photons more than 10 km apart
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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.
Forward citations
Cited by 3 Pith papers
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Structural constraint on delayed-choice quantum eraser architectures
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Cavity-Induced Suppression of Entanglement and Enhancement of Quantum Discord
Cavity boundaries suppress distillable entanglement negativity between Unruh-DeWitt detectors but preserve mutual information and enhance quantum discord at larger separations.
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Particle Collisions & Quantum Entanglement in High-Energy Collisions
A review summarizing advancements in probing quantum entanglement and Bell inequalities using high-energy particle colliders.
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