Quote Originally Posted by AliG View Post
Interesting. So really the accomplishment is in trasfering the quantum state, not actually the "teleportation" as the tomshardware article called. That is genuinely impressive.
Yeah, it's movement of the quantum state, not the particle itself. Which is basically what I expected but that's okay. I only know a bit about "spooky action at a distance". One thing I was hoping they'd cover in the UCalgary article was whether or not the transfer or state from one entangled photon to the next was indeed instantaneous, or whether it had any propagation delay. I've seen hundreds of times on Slashdot (and elsewhere) where some quantum physics fanatic assumes that transfer of state is in fact instantaneous, only to be smacked down by skeptics that assume that all observable physical phenomena have a maximum propagation speed of c (the speed of light). The UCalgary article didn't quite touch on that point specifically . . . or not that I gleaned from reading it anyway. Maybe I'm just being unobservant.

Even still, the crypto community will love it since it could theoretically allow the transfer of classical information via alterations of state once the entangled pairs have been split apart, making interception of information virtually impossible.

Quote Originally Posted by Cold Fussion View Post
I really don't understand the problem, the tomshardware article is essentially just paraphrase of the article on the University of Calgary site and it clearly states the quantum state of two entangled photons was kept as it was transferred over fibre. I don't understand how that is at all misleading.
Wellll this quote was misleading:


Researchers from the University of Calgary, Canada, teleported a photon (particle of light) over a six kilometer distance through a ?dark fiber? cable. The accomplishment set a new record in quantum teleportation, getting us a little closer to having quantum networks, and ultimately a quantum internet.
While this quote was not so misleading:

?Being entangled means that the two photons that form an entangled pair have properties that are linked regardless of how far the two are separated,? explained Wolfgang Tittel, professor in the Department of Physics and Astronomy at the University of Calgary and leader of the project.

?When one of the photons was sent over to City Hall, it remained entangled with the photon that stayed at the University of Calgary.?
The photon whose state was teleported to the university was then generated in a third location in Calgary, and then it also traveled to the City Hall, where it met the photon that was part of the entanglement pair.

?What happened is the instantaneous and disembodied transfer of the photon?s quantum state onto the remaining photon of the entangled pair, which is the one that remained six kilometres away at the university,? said Tittel.