Edith

 What I was saying is specifically about how Quantum Darwinism views things (in my understanding) - and since interpretations of QM are trying to be more fundamental than QM itself (since QM should be derived from them), we can't use QM arguments here.

With this I just wanted to point out that I was not making any argument that relies on a particular interpretation of QM to work up to interaction-free measurements. I wanted to make it clear that I was not arguing anything about a collapse mechanism/what happens under the hood - it's just empirically correct that the result of any measurement is a definite state. You don't need any theory, it's... (read 407 more words →)

So for the cat, a superposition of dead and alive will never be "objective" since it is not stable under interactions with photons – and so cannot be copied many times.

Ask yourself what is being copied many times. The very fact that the quantum cat is in a superposition of only alive and dead tells you something else that is only apparently "consensus objective"; everyone agrees that the only possible definite states associated with the system are that the quantum cat is alive, or dead, and nothing else. This just kicks the definition of "objective" back to the specification of the state vector. There is something objective about the fact that the... (read 354 more words →)