3 ms·
Whether communication is “instant” doesn’t matter because it takes the speed of light to observe. Say A and B are entangled, both observers of A and B know the
by armchairhacker 4y ago
Whether communication is “instant” doesn’t matter because it takes the speed of light to observe.
Say A and B are entangled, both observers of A and B know they are entangled, A and B don’t have a value yet, there’s only A != B.
When A gets measured, it takes the speed of light for A’s measurement to reach B. If B gets measured before then it’s still a 50/50 (and then when A is revealed it will 100% be the opposite of B).
It’s true that if B gets measured B’s observer will instantly know A. But this doesn’t break the speed of light because B’s observer already knew that A != B, so they don’t need any more information from A to determine it when they measure B. Like how, if B and A were predetermined (not quantum) and then separated and B was revealed, B’s observer will instantly know A.