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Letter

Nature Physics 5, 389–392 (1 June 2009) | doi:10.1038/nphys1255

High-fidelity transmission of entanglement over a high-loss free-space channel

Alessandro Fedrizzi , Rupert Ursin , Thomas Herbst , Matteo Nespoli , Robert Prevedel , Thomas Scheidl , Felix Tiefenbacher , Thomas Jennewein & Anton Zeilinger

Quantum entanglement enables tasks not possible in classical physics. Many quantum communication protocols require the distribution of entangled states between distant parties.