Re: Electron Pairing, anyone?
> Not only that, there was quite the speculation that it would happen instantaneously - no matter the distance (thereby circumventing light speed restrictions on data transfer).
You can't send useful information faster than the speed of light. Reality doesn't appear to work like that. Perhaps you're thinking of quantum superdense coding which allows you to significantly increase the bandwidth available from more mundane communication channels, but you still can't send a message any faster than the speed of light.
The two halves of the electron pair (or indeed any other quantum bit carrying medium) must be *together* when entangled, so you have to send one half of the pair away with the person you're communicating with.
They can then perform some operation on it, and send it back to you. The trick is that the quantum state can hold more bits of quantum information than it can of classic information, thus increasing the bandwidth of the channel. Furthermore, interception of the bit in transit gives no useful information at all, because both halves of the state are required for useful decoding.
You're still having to send 2 bits out and 2 bits back for a total of, say, 4 bits of useful information exchange, but compared to one-time pads and the like, superdense coding is much higher bandwidth (which would only send 2 bits of useful information in this case).
> What happened to all of this?
Was never possible. General relativity puts serious limits on the number of awesome sci-fi toys and tools that can exist in reality.
Stopping quantum decoherence and related issues is why we don't have commercial quantum computers and communication lines... its pretty tricky stuff. Easier than fusion though, I reckon, so maybe its only 20 years off? :o)
> TL; DR
GBT physics class. No FTL communications for you, ever.