Long-distance free-space distribution of quantum entanglement.
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.
Aspelmeyer
Markus
M
Institut für Experimentalphysik, Universität Wien, Boltzmanngasse 5, A-1090 Wien, Austria. markus.aspelmeyer@quantum.at
Böhm
Hannes R
HR
Gyatso
Tsewang
T
Jennewein
Thomas
T
Kaltenbaek
Rainer
R
Lindenthal
Michael
M
Molina-Terriza
Gabriel
G
Poppe
Andreas
A
Resch
Kevin
K
Taraba
Michael
M
Ursin
Rupert
R
Walther
Philip
P
Zeilinger
Anton
A