Can one detect whether a wave function has collapsed

@article{Cowan2014CanOD,
  title={Can one detect whether a wave function has collapsed},
  author={C. W. Cowan and R. Tumulka},
  journal={Journal of Physics A},
  year={2014},
  volume={47},
  pages={195303}
}
Consider a quantum system prepared in state ψ, a unit vector in a d-dimensional Hilbert space. Let b1, ..., bd be an orthonormal basis and suppose that, with some probability 0 < p < 1, ψ 'collapses', i.e., gets replaced by bk (possibly times a phase factor) with Born's probability |〈bk|ψ〉|2. The question we investigate is: how well can any quantum experiment on the system determine afterwards whether a collapse has occurred? The answer depends on how much is known about the initial vector… Expand
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