How one shutter can closeNslits

Y. Aharonov, L. Vaidman
2003 Physical Review A. Atomic, Molecular, and Optical Physics  
It is shown that a quantum shutter, pre- and post-selected in particular quantum states, can close simultaneously arbitrary number of slits preventing the passage of a single photon in an arbitrary state. A set of K pre- and post-selected shutters can close the slits preventing the passage of K or less photons. This result indicates that the surprising properties of pre- and post-selected quantum systems are even more robust than previously expected.
doi:10.1103/physreva.67.042107 fatcat:vjb6jbx3xbcwldzvfptqgahkl4