Do macro objects get entangled?

In summary: Yes, the superposition is "gone" in the sense that it is no longer observable or relevant for practical purposes. Alice's observation has effectively collapsed the superposition into a definite state. The other humans, not having observed the particle, are still in a state of superposition with respect to the particle's spin.
  • #141
Indeed. Isolation is not part of the original setup. Can the quantum system be said to be in a definite state, even when not isolated? No. It's in a probabilistic state.
These measurement paradoxes are never trivial.
 

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