4 ms·
> things don't exist unless you look at them at the quantum level But looking IS measuring.
by cLeEOGPw 11y ago
> things don't exist unless you look at them at the quantum level
But looking IS measuring.
- coldnebo 11y agoSure. But either term is usually passive in classical contexts and always destructive in QM contexts. You can't uncollapse a wave function! Consider a twist on Schrödinger's cat experiment: there are two scientists, A and B. The box can only be opened by one scientist at a time... the other scientist must wait outside the room. Scientist A looks in the box and collapses the wave function and sees that the cat is dead. What is the probability that scientist B will see a dead cat when she opens the box afterwards? 50%? 100%?
- coldnebo 11y agoOr, more simply: by the time you've 'looked' and understood what you are looking at, billions of other particles have already interacted with the experiment output, collapsing the wave function... so no, by the time you actually look at anything, it's classical, not QM.