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Unitary collapse of Schrödinger’s cat state https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.L030202

Schrödinger’s cat, that iconic thought experiment where a cat in a box is both alive and dead until someone peeks.

The authors study a system composed of a single qubit coupled to a soft-mode quantum oscillator. They show that spontaneous unitary evolution of this system create a Schr\ odinger-cat-like state of the oscillator, which is subsequently lost in a sudden process strongly resembling the measurement-induced collapse of wave function.