Long-Distance Free-Space Distribution of Quantum Entanglement
Markus Aspelmeyer, Hannes R. Böhm, Tsewang Gyatso, Thomas D. Jennewein, Rainer Kaltenbaek, Michael Lindenthal, Gabriel Molina‐Terriza, Andreas Poppe, Kevin J. Resch, Michael Taraba, Rupert Ursin, Philip John Walther, Anton Zeilinger · Science · 2003
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.