Three-Color Entanglement
A. S. Coelho,1
F. A. S. Barbosa,1
K. N. Cassemiro,2
A. S. Villar,2,3
M. Martinelli,1
P. Nussenzveig1,*
Entanglement is an essential quantum resource for the acceleration
of information processing as well as for sophisticated quantum
communication protocols. Quantum information networks are expected
to convey information from one place to another by using entangled
light beams. We demonstrated the generation of entanglement
among three bright beams of light, all of different wavelengths
(532.251, 1062.102, and 1066.915 nanometers). We also observed
disentanglement for finite channel losses, the continuous variable
counterpart to entanglement sudden death.
2 Max Planck Institute for the Science of Light, Günther-Scharowsky-Strasse 1/Bau 24, 91058 Erlangen, Germany.
3 University of Erlangen-Nuremberg, Staudtstrasse 7/B2, 91058 Erlangen, Germany.
* To whom correspondence should be addressed. E-mail: nussen{at}if.usp.br
