The science behind teleporters.

[Reach]

Originally Posted by Reincarnate

I really hate it when people bring up entanglement. You cannot use quantum entanglement to communicate faster than light.

Think of it this way. Consider a message you want to send to a friend. You want to use a coin for this. So you flip the coin -- and whatever it lands on, hold it up so you see your side and your friend sees the other. This is like an entangled state that collapses the wavefunction -- if you see heads, your friend will see tails. If you see tails, your friend will see heads.

Now, using just that coin alone, transmit a message to your friend.

Stuff like this gets brought up a lot because a number of experiments have reporting using entanglement to get light pulses to 'move' faster than c, among other methods (e.g. cesium gas).

Interestingly, phase or group velocity CAN exceed c, seemingly infinitely. This is well established. They, however, cannot exceed c at the same time.

Though, signal velocity (speed of information) can't exceed c, despite it usually being equal to group velocity.

Confusing, but the bottom line is you're right. Electromagnetic radiation can exceed light speed in vacuum, but only under conditions where there is no information transfer.