Physics – Quantum Physics
Scientific paper
2006-10-20
Physics
Quantum Physics
This version includes a better answer to Hosten and Kwiat comment [quant-ph/0612159]
Scientific paper
Recent proposal for counterfactual computation [Hosten et al., Nature, 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 post-selected quantum particles: the particle can reach a certain location without being on the path that leads to this location.
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