From: ram@zedat.fu-berlin.de   
      
   JTEM  wrote or quoted:   
   |Because photons don't experience "Distance" either. No time, no   
   |distance, so just as two entangled photons appear to "Magically"   
   |send information across vast distances, they also appear to send info   
   |backwards in time. Because for them they are always in the same place   
   |and it's always the same time.   
      
     You mixed some right points with some others that are correct   
     but not really relevant here. - For any path an object   
     moves on, you can find a moving coordinate system where the   
     object is always at rest, but that doesn't matter for this   
     interference experiment.   
      
     I came up with something that shows "sending information back   
     in time" in a way that's much simpler:   
      
     A photon goes through a hole and gets scattered. Even though it   
     could hit anywhere, let's just think about two spots, +x and -x.   
      
   |              |        #|+x   
   |              |     .-'#|   
   |              |  .-'    |   
   |  Photon --->  :        |   
   |              |  '-.    |   
   |              |     '-.#|   
   |              |        #|-x   
      
     Right before the photon hits the screen, the chance of hitting +x is   
     the same as -x. So if you buy into locality, right before the photon   
     is detected, there's got to be something in the space before +x that   
     contains something that may let the photon show up there, and the   
     same for the space before -x. I marked those spots with "#" above.   
      
     If the photon actually lands at +x, it can't also land at -x   
     because there's only one photon, not two. So if the photon gets   
     detected at +x, the signal about that has to get to the area before   
     -x right away, so it's not detected there too. This would mean a   
     faster-than-light signal, basically like sending signals to the past.   
      
     But that's not a problem for the rule that info can't travel   
     faster than light, 'cause we can't modulate this signal from   
     outside to use it to send info. You could call this a "signal" or   
     "information," but it's a special kind of information that travels   
     inside a single quantum system, so I say "signal" to keep it clear.   
      
     If you want to read more about this, there's the "Afterword"   
     in "Introduction to Quantum Mechanics" by David J. Griffiths,   
     where he asks, "Why are physicists so alarmed at the idea   
     of superliminal influences?" at the end of section "A.2".   
      
     He does not use my simple thought experiment from above; it was   
     me who made this up, but otherwise he says something similar   
     about the consequences: It's a superluminal influence, but   
     can't be used to send outside information superluminally.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)