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To: axial who wrote (41284)8/15/2012 5:24:08 AM
From: LindyBill  Respond to of 46821
 
quantum teleportation

I am losing it with this. Sounds like magic. If this engineers out, are we looking at wireless transmission of data in volume? Where does it lead?



To: axial who wrote (41284)8/15/2012 1:30:48 PM
From: pltodms2 Recommendations  Read Replies (1) | Respond to of 46821
 
"demonstrated entanglement between two receivers separated by 101.8 km"

This is phenomenal, Jim.

Regardless of imminent practical applications (or not) with this successful test, it validates some profound insights into quantum theory. Like any new piece of evidence substantiating scientific theories, who can say what it could lead to. Likewise with the recent discovery of the Higgs particle.

If we lose the wonder of discovery and relegate all our actions to bottom line effectiveness, we lose our humanity.



To: axial who wrote (41284)3/9/2013 6:24:37 PM
From: axial  Respond to of 46821
 
Chinese Physicists Measure Speed of “Spooky Action At a Distance”

Einstein railed against the possibility of spooky action at a distance because it violates relativity. Now Chinese physicists have clocked it travelling more than four orders of magnitude faster than light

' ...
the trick is to create a stream of entangled photons and to measure the spooky action continuously for 12 hours or more. If the experiment is aligned in an East-West direction, the contribution from the Earth’s rotation should drop out over that time. Juan and co have perfected this technique by sending photons through the atmosphere from a fish farm near Qinghai Lake in the Tibetan Plateau. (We looked at their work last year when the same team smashed the distance record for teleporting photons using similar gear.) They say the results are clear but do not measure the speed of spooky action directly. Instead, the results place a lower bound on how fast it must be. The answer is that it is at least four orders of magnitude faster than light, and may still turn out to be instantaneous, as quantum mechanics predicts. If this result sounds familiar, it’s because a European team based at the University of Geneva in Switzerland carried out a similar experiment in 2008 getting a similar result. However, this turned out to contain a loophole which allowed the results to be explained without entanglement. “All previous experiments along this direction have locality loopholes and thus can be explained without having to invoke any `spooky action’ at all,” say Juan and co.

Now the Chinese team claim to have closed this loophole and say theirs is the first legitimate measurement of the speed of spooky action. It’ll be interesting to see whether they can raise this bound in future and find out how fast they can go.'

http://www.technologyreview.com/view/512281/chinese-physicists-measure-speed-of-spooky-action-at-a-distance/

Jim