Long-Distance Free-Space Distribution of Quantum Entanglement

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Science  01 Aug 2003:
Vol. 301, Issue 5633, pp. 621-623
DOI: 10.1126/science.1085593

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We demonstrate the distribution of quantum entanglement via optical free-space links to independent receivers separated by 600 m, with no line of sight between each other. A Bell inequality between those receivers is violated by more than four standard deviations, confirming the quality of the entanglement. This outdoor experiment represents a step toward satellite-based distributed quantum entanglement.

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