Communications: quantum teleportation across the Danube.
Efficient long-distance quantum teleportation is crucial for quantum communication and quantum networking schemes. Here we describe the high-fidelity teleportation of photons over a distance of 600 metres across the River Danube in Vienna, with the optimal efficiency that can be achieved using linear optics. Our result is a step towards the implementation of a quantum repeater, which will enable pure entanglement to be shared between distant parties in a public environment and eventually on a worldwide scale.
Ursin
Rupert
R
Institute for Experimental Physics, University of Vienna, 1090 Vienna, Austria. rupert.ursin@univie.ac.at
Jennewein
Thomas
T
Aspelmeyer
Markus
M
Kaltenbaek
Rainer
R
Lindenthal
Michael
M
Walther
Philip
P
Zeilinger
Anton
A