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I do understand how quantum entanglement works, but I don't understand how this can help us communicate. Just because you know the value of the other, there's no way to change it (as far as I know), so it would be the same, so you couldn't send a bit. I know there's something I'm missing, but I'd really like to understand this, so it would be very helpful. If you could, please break it down for me and maybe use an example, too. Thanks in advance!

EDIT:
So from what I'm getting from some of the comments, I realize that it's not exactly what I'd imagined, and you can't really send data through entangled particles.

Blue Herring
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It doesn't. For some reason it's widely believed that entangled particles can be used to communicate faster than light, but that isn't actually true. The no-communication theorem says that even slower-than-light communication via entanglement isn't possible.

The closest thing to "communication with the help of entanglement" that comes to mind is quantum teleportation, which makes it possible to move qubits from point A to point B with only a classical channel from A to B (at a cost of one Bell pair per qubit). There could potentially be situations where this is easier than sending the qubit over a quantum channel. The situations where it might be useful are pretty limited, though, because you still need a quantum channel between A and B to distribute the Bell pairs.

benrg
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