Abstract
A recent proposal for counterfactual computation [O. Hosten et al., Nature (London) 439, 949 (2006)] is analyzed. It is argued that the method does not provide counterfactual computation for all possible outcomes. The explanation involves a novel paradoxical feature of pre- and postselected quantum particles: The particle can reach a certain location without being on the path that leads to this location.
- Received 20 October 2006
DOI:https://doi.org/10.1103/PhysRevLett.98.160403
©2007 American Physical Society