Before measurement the wavefunction of a quantum particle, eg an electron, evolves in a superposition state. Can the following wavefunction $$\Psi = 1\,\,\lvert \uparrow \rangle + 0 \,\,\lvert \downarrow \rangle$$ in priciple also be considered as a superposition (conservation of probabilities), or does it describe already and only the "collapsed" eigenstate?
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