Re:Quantum ‘spookiness’ passes toughest test yet
by gus_massa on Sunday August 30, 2015 @07:34AM
(#10143029)
They use a optic fiber. This version has mare technical details, but is still understandable: http://arstechnica.com/science/2015/08/experiment-confirms-t... (HN: https://news.ycombinator.com/item?id=10141658 (4 points, 12 hours ago, 1 comment))
> To get around this, the researchers started with the diamonds over a kilometer apart in two different labs at the Delft University of Technology. They entangled each electron spin with a photon, then sent the photons over fiber optic cable to a third lab somewhere in between. There, the photons were entangled, which in turn caused the electrons in the diamonds to be entangled as well.
Re:Quantum ‘spookiness’ passes toughest test yet
by crishoj on Sunday August 30, 2015 @08:22AM
(#10143124)
Another enlightening point is that there is a significant loss in the optic fibers:
> The whole process was horribly inefficient, with a success rate of 6.4 × 10−9, mostly because photons kept getting lost in the fiber optic cables. But, over the course of nine days, the setup managed to successfully entangle the nitrogen vacancies 245 times.
"The researchers started with two unentangled electrons sitting in diamond crystals held in different labs on the Delft campus, 1.3 kilometres apart. Each electron was individually entangled with a photon, and both of those photons were then zipped to a third location."