Do you really believe that before measurement, the atom is in a superposition of all possible states. How about cat, before measurement, is the cat in a superposition of life and death?The collapse of the wavefunction is associated with measurement. If you perform a measurement on the hydrogen atom, you force the wavefunction to collapse into one of the eigenvectors of the measured observables.
Before measurement, the atom is in a superposition of all possible states. You get a superposition of all the discrete energy levels. But it is only upon observation that you get a specific spectral line (or photon). And repeated measurements (or observing many atoms at once) gives the whole atomic spectrum as we know it.
I leave it up to your philosophy to answer that ! It is a postulate of QM that a measurement changes a superposition to a definite eigenstate. Prior to that, it is a superposition of states. What this means in reality, well, is beyond experiments.Do you really believe that before measurement, the atom is in a superposition of all possible states. How about cat, before measurement, is the cat in a superposition of life and death?
What makes you think you can treat that which is measured and that which is measuring as separate systems?Do you really believe that before measurement, the atom is in a superposition of all possible states. How about cat, before measurement, is the cat in a superposition of life and death?
Why is the Copenhagen interpretation being taken for granted here?I leave it up to your philosophy to answer that ! It is a postulate of QM that a measurement changes a superposition to a definite eigenstate. Prior to that, it is a superposition of states. What this means in reality, well, is beyond experiments.
If Schroedinger's cat is a problem in some interpretation, decoherence cannot solve it. With decoherence, a macroscopic superposition becomes even more macroscopic, without remaining to be a superposition.See Quantum Decoherence.
See also Murray Gell-Mann's classical 'Quark and the Jaguar'
Schrodinger's cat 'problem' is not considered to be a problem at all.
The box is in contact with the environment, there's decoherence and the cat dies or lives.
They don't, nowadays it is mostly a topic that comesup on Internet forumswhy on earth physicists are still discussing QM even after 80 years later?