Martin Winlow
I don't want to knock Mr Einstein (and perhaps someone who knows more about quantum physics than me can help me out here) but, surely, 2 photons of light, emitted from opposite sides of the Sun, will have a speed *relative to each other* of twice the speed of light...? So, 'poof' goes that theory...No?
Mike Emery
Previous commenter would be right (about two photons) IF time and space were Euclidean. It was Einstein greatest intuitive leap to consider that might not be true. Space-time is not Euclidean and you cannot simply add two velocities together. Besides that, it's not quite what Einstein said -- "nothing can go faster than light" is a simplification. Easy example: take your laser pointer and wave it at the moon. The (weak!) spot of light on the moon's surface easily exceeds the speed of light .Better to say "nothing can deliver information or energy faster than light would".
Vernon Miles Kerr
It seems the effects of quantum entanglement do not violate relativity if one pictures the entangled photons as at opposite ends of a 1200 kilometer piece of twine. Pulling on one end of the twine would immediately be felt at the other end, regardless of distance. Travel time: zero.
@Martin I don't pretend to be much knowledgeable about this either but here are 2 links that describe why the relative velocity of any 2 entities (photons) can only be at most c = speed of light. In essence the bottom line is that Vrelative = V1 - V2 is only approximately correct when neither of the velocities are close to c. There is thus a different formula that describes how relative velocity functions in the special relativity model.
And another bonus link on the idea/importance of the speed of light.
Classical physics finds that mass increases with speed, becoming infinite at lightspeed; which means only massless items can travel at lightspeed? Photons are massless and can have the properties of both particle and wave. As for quantum mechanics, it is incomprehensible to me- Feynman - Nobody understands Quantum Mechanics-
Vernon Miles Kerr gave the best explanation of quantum entanglement I've ever seen.
Douglas Bennett Rogers
The transit time could easily be measured in this experiment. One would think that it would just be part of the data. You could see right away if it was faster than light. Two photons emitted in opposite directions from a source will be seen to separate at 2c. The separation speed as seen from either photon is infinite.
Beam me up, one piece please!
Stephen N Russell
To Upscale for human use??? later IE say 2050??