Experimental Realization of Interaction-Free Measurement

Author(s): P. G. Kwiat, H. Weinfurter, T. J. Herzog, A. Zeilinger, M. Kasevich

Journal: Fundamental Problems in Quantum Theory, D.M. Greenberger, A. Zeilinger (Eds.), Annals of the New York Academy of Sciences

Page(s): 383

Year: 1995

DOI Number: --


We have demonstrated experimentally that one can ascertain the presence of an object inside an interferometer without interacting with it. The simplest scheme uses photons incident on a Michelson interferometer. With a 50-50 beam splitter, 33% of the measurements can be interaction-free. We also propose a novel scheme in which the fraction of interaction-free measurements can be arbitrarily close to 1. In the new scheme we interrogate the region with the object many times, but only weakly.

Note: also in “Fundamental Problems in Quantum Theory”, D. M. Greenberger, A. Zeilinger (Eds. )

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