Satellite-based entanglement distribution over 1200 kilometers

Les francophones auront peut-être vu l’article assez ridicule de l’Express ▻http://www.lexpress.fr/actualite/sciences/teleportation-quantique-tout-comprendre-a-la-prouesse-realisee-par-la-chine auquel je réponds en ►http://www.bortzmeyer.org/communication-quantique.html

et pour faire court, la conclusion de Stéphane Bortzmeyer :

Voilà, comme d’habitude, on a une avancée scientifique réelle, décrite dans un article sérieux mais que personne ne lira, sur-vendue dans un dossier de presse aguicheur, lui-même repris sans critique et sans vérification dans de nombreux médias. Vu l’information reçue par les citoyens ordinaires, il n’est pas étonnant que la sécurité informatique soit actuellement si mauvaise.

We have demonstrated the distribution of two
entangled photons from a satellite to two ground
stations that are physically separated by 1203 km
and have observed the survival of entanglement
and violation of Bell inequality. The distributed
entangled photons are readily useful for
entanglement-based quantum key distribution
which, so far, is the only way that has been demonstrated
to establish secure keys between two
distant locations with a separation of thousands
of kilometers on Earth without relying on trustful
relay. Another immediate application is to exploit
the distributed entanglement to perform a variant
of the quantum teleportation protocol for
remote preparation and control of quantum states,
which can be a useful ingredient in distributed
quantum networks. The satellite-based technology
that we developed opens up a new avenue
to both practical quantum communications and
fundamental quantum optics experiments at distances
previously inaccessible on the ground