The curious quantum mechanics of pre- and post-selected ensembles

@article{Hu1990TheCQ,
  title={The curious quantum mechanics of pre- and post-selected ensembles},
  author={Wayne Hu},
  journal={Foundations of Physics},
  year={1990},
  volume={20},
  pages={447-458}
}
Despite claims to the contrary, the curious statistical properties of pre- and post-selected ensembles are neither impossible nor surprising. The properties of weak measurements on such ensembles are examined and shown to be in complete accord with ordinary quantum mechanics. 

Figures from this paper.