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Originally published in Science Express on 19 June 2003
Science 1 August 2003:
Vol. 301. no. 5633, pp. 621 - 623
DOI: 10.1126/science.1085593
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Reports

Long-Distance Free-Space Distribution of Quantum Entanglement

Markus Aspelmeyer,* Hannes R. Böhm, Tsewang Gyatso, Thomas Jennewein, Rainer Kaltenbaek, Michael Lindenthal, Gabriel Molina-Terriza, Andreas Poppe, Kevin Resch, Michael Taraba, Rupert Ursin, Philip Walther, Anton Zeilinger{dagger}

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.

Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, A-1090 Wien, Austria.



{dagger} All authors contributed equally to this work.

* To whom correspondence should be addressed. E-mail: markus.aspelmeyer{at}quantum.at or zeilinger-office{at}quantum.at

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Science. ISSN 0036-8075 (print), 1095-9203 (online)