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In Reply to: RE: Seems to confirm Einstein/Rosen/Podolsky theorem . . . posted by caspian@peak.org on August 11, 2010 at 12:25:53
Consider 2 sealed boxes, one with a red ball inside, the other with a green ball. Someone takes one of the boxes and goes 10 light years away. Someone left on earth opens the remaining box and sees a red ball. He then knows the ball 10 light years away is green. But the guy 10 light years away does not know that until he measures it himself or gets a message from earth which takes 10 years.
The quantum case is different because probabilities collapse to certainties in both places, indicating some sort of strange long distance correlation. But this cannot be used to transmit information. The guy 10 light years away will still not have information until he either does a measurement or receives a message from earth. Nobody has found a loophole.
Follow Ups:
"Consider 2 sealed boxes, one with a red ball inside, the other with a green ball. Someone takes one of the boxes and goes 10 light years away. Someone left on earth opens the remaining box and sees a red ball. He then knows the ball 10 light years away is green. But the guy 10 light years away does not know that until he measures it himself or gets a message from earth which takes 10 years."
How does this figure into faster than light transmission?
Consider a rod of some 'material' 10 light years long. It is infinitely rigid and almost massless. When the first person opens his box he strikes one end of the rod. This in turn strikes a bell ten light years away, indicating the color of the ball.
The problem is there is no such animal as an infinitely rigid rod. A rod made out of matter will have to transmit an impulse atom to atom or molecule to molecule- and under our current understanding that will be slower than the speed of light in a vacuum. Your second suggestion, the wormhole, may actually work, however, it is still a most speculative concept at this point. Put it this way- if you can bend spacetime so that a point that was 10 light years away is just 2 meters away, then you can send a message and then unbend the fabric of space time. But how this might be done or whether it is even possible is not known right now.
or wormhole.
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