Entanglement-based quantum communication over 144km

Author(s): R. Ursin, H. Weinfurter, C. Barbieri, Z. Sodnik, J. G. Rarity, M. Meyenburg, M. Fürst, B. Ömer, P. Trojek, J. Perdigues, T. Jennewein, B. Blauensteiner, M. Lindenthal, T. Scheidl, H. Weier, T. Schmitt-Manderbach, F. Tiefenbacher, A. Zeilinger

Journal: Nature Physics

Volume: 3

Page(s): 481-486

Year: 2007

DOI Number: --

Link: Link to publication


Quantum entanglement is the main resource to endow the field of quantum information processing with powers that exceed those of classical communication and computation. In view of applications such as quantum cryptography or quantum teleportation, extension of quantum-entanglement-based protocols to global distances is of considerable practical interest. Here we experimentally

demonstrate entanglement-based quantum key distribution over 144 km. One photon is measured locally at the Canary Island of La Palma, whereas the other is sent over an optical free-space link to Tenerife, where the Optical Ground Station of the European Space Agency acts as the receiver. This exceeds previous free-space experiments by more than an order of magnitude in distance, and is an essential step towards future satellite-based quantum communication and experimental tests on quantum physics in space.

Note: Nature Highlight of the Year 2007

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