2 ms·
One outcome of this is that faster-than-light communication is definitely a thing, but we can't use it. An analogy is that there are two telegraph operators in
by dreamcompiler 2y ago
One outcome of this is that faster-than-light communication is definitely a thing, but we can't use it.
An analogy is that there are two telegraph operators in different cities. You write a message on a piece of paper and hand it to the operator in St. Joseph, Missouri. He transcribes it into Morse code and sends it to another operator in San Francisco, who transcribes it back into English for the recipient there.
EPR pairs are like those telegraph operators, except they can communicate with each other instantly across the entire universe.
Wow!
Unfortunately they also have a few caveats:
1. The sending operator completely ignores the message you wrote down and sends a random message instead. You can control when the message is sent and you can see what message was sent, but you cannot control the contents of the message.
2. The recipient can see what message was received on the receiving end, and they can prove it is causally correlated with the sent message by using out-of-band (i.e. ordinary sublight) communication.
3. Once a [random] 1-bit message has been sent, both operators cut the telegraph wires and they can never communicate with each other again.