from Forbes Website
In 2010, that team successfully teleported a photon over 16km.
Now that same team has released new findings, in which they claim to have teleported photons nearly 100km, or over 60 miles. Now, quantum teleportation isn’t quite the same thing as the teleportation in Star Trek.
When researchers teleport a photon, they aren’t teleporting the actual photon, but rather the information contained in it through quantum entanglement.
In essence, the second photon at the end
of the teleport becomes the first one - or at least, it becomes an
qubit of information. So the
information is exchanged without actually travelling through the
Fiberoptics don’t work, because once you get to distances over about 1 kilometer, the fiber absorbs so much light that the information is lost. But while a fiberoptic cable can keep photons focused, moving over free space means using lasers - which inevitably causes the beam of light to spread out over time.
However, using a powerful laser along
with some other optical equipment, the researchers here developed a
technique to keep the beam focused over the course of 97km, and
successfully achieved quantum teleportation.
As Technology Review notes,
That technology is still a long way off, however.
Despite the fact that the communication
developed here is very efficient, it’s also very slow. They’ll also
have to keep improving the distance. 60 miles for teleportation is a
new record. It’s impressive. But communications satellites are
typically in geosynchronous orbit - 22,236 miles up in the air.