Comments by "⃠" (@U20E0) on "Dr Ben Miles"
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Physics being relative to perspective is confusing as always. “observe” is just a convenient word to use.
Example system: you have some things, A B, and C,
which have numbers, and can interact by averaging their numbers.
A has a superposition of 2 and 4 as it’s number, B has 7, C has 9.
If B interacts with A, from the perspective of B the following happens:
A collapses to 4 and both become 5.5
But from the perspective of C the particles become entangled:
A remains in superposition, and B becomes a superposition of 5.5 and 4.5.
After all, how can C know that A became 4 and thus B 5.5 without observing the result?
The superposition only collapses from your perspective when you “enter” it by observing it, so from your perspective your observation and your observation only can collapse a superposition.
And it only gets more confusing from here by my understanding:
If C were to now interact with B, from B’s perspective:
B itself is 5.5, C is 9, so both become 7.25.
From C’s perspective, B can collapse to 5.5 ( and A to 4 ), making both B and C 7.25.
OR
B can collapse to 4.5 ( and A to 2 ), making both B and C 6.75.
In the latter case C now exists in a different timeline. But that in not detectable in any way because everything makes perfect sense from all perspectives, other than that of the omnipresent reader of this comment
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