Note to users. If you're seeing this message, it means that your browser cannot find this page's style/presentation instructions -- or possibly that you are using a browser that does not support current Web standards. Find out more about why this message is appearing, and what you can do to make your experience of our site the best it can be.

Published Online June 19, 2003
Science DOI: 10.1126/science.1085593

Reports

Submitted on April 11, 2003
Accepted on June 10, 2003

Long-Distance Free-Space Distribution of Quantum Entanglement

Markus Aspelmeyer 1*, Hannes R. Böhm 1, Tsewang Gyatso 1, Thomas Jennewein 1, Rainer Kaltenbaek 1, Michael Lindenthal 1, Gabriel Molina-Terriza 1, Andreas Poppe 1, Kevin Resch 1, Michael Taraba 1, Rupert Ursin 1, Philip Walther 1, Anton Zeilinger 1*

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

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

We demonstrate the distribution of quantum entanglement via optical free-space links to independent receivers separated by 600 m and without a line of sight between each other. A Bell inequality between those receivers is violated by more than 4 standard deviations confirming the quality of the entanglement. This outdoor experiment represents a step towards satellite-based distributed quantum entanglement.




To Advertise     Find Products

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