If there’s anything to see the quantum state has collapsed. The universe is the observer, an emitted photon is an example of an event that will be observed
That is why only tiny things and things near absolute zero exhibit quantum effects
This comment might be simplified too far to be close enough to accurate. I don’t know the complex explanation, I’m not skilled in the right sorts of maths
If there’s anything to see the quantum state has collapsed. The universe is the observer, an emitted photon is an example of an event that will be observed
That is why only tiny things and things near absolute zero exhibit quantum effects
This comment might be simplified too far to be close enough to accurate. I don’t know the complex explanation, I’m not skilled in the right sorts of maths