Nature Physics: Entanglement-based quantum communication over 144 km

04. Jun 2007  — Nature Physics reports on the first experimental demonstration of entanglement-based quantum key distribution over 144 km.


Nature Physics: Entanglement-based quantum communication over 144 km


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. 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.

In collaboration with

LMU Munich, Germany
MPQ Garching, Germany
University of Bristol, UK
University of Padova, Italy
ARC Seibersdorf, Austria
ESA - ESTEC, The Netherlands
IAC, Spain

Entanglement-based quantum communication over 144 km

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