Disagree about the cat, the decay is a quantum process, the probabilistic decays of the single atom happen because you are observing a superposition; the same happens with electrons going from higher to lower orbitals—these are usually calculated with Fermi’s golden rule, which explicitly deals with superpositions caused by the perturbation. Even if you believe Copenhagen, the atom is in superposition before collapse. Even if the details on the Fermi’s golden rule page are not easily checkable—the fact that the result is a transition probability despite being about a single state that’s being affected deterministically should show you that it’s a quantum thing.
However: once you observe, indeed whatever’s left remains. And both parts of the superposition will fall into their respective stability wells. In general, you could thus imagine bistable equilibria on the parts of the states + the coefficients combining them. And then you could contrast with equilibria on the entire state? I can’t think of any good examples of the latter, though.
Disagree about the cat, the decay is a quantum process, the probabilistic decays of the single atom happen because you are observing a superposition; the same happens with electrons going from higher to lower orbitals—these are usually calculated with Fermi’s golden rule, which explicitly deals with superpositions caused by the perturbation. Even if you believe Copenhagen, the atom is in superposition before collapse. Even if the details on the Fermi’s golden rule page are not easily checkable—the fact that the result is a transition probability despite being about a single state that’s being affected deterministically should show you that it’s a quantum thing.
However: once you observe, indeed whatever’s left remains. And both parts of the superposition will fall into their respective stability wells. In general, you could thus imagine bistable equilibria on the parts of the states + the coefficients combining them. And then you could contrast with equilibria on the entire state? I can’t think of any good examples of the latter, though.