Experimental Realization of Interaction‐free Measurements a

@article{Kwiat1995ExperimentalRO,
  title={Experimental Realization of Interaction‐free Measurements a},
  author={Paul G. Kwiat and Harald Weinfurter and Thomas Herzog and Anton Zeilinger and Mark A. Kasevich},
  journal={Annals of the New York Academy of Sciences},
  year={1995},
  volume={755}
}
Recently, it has been pointed out that it is possible to make a quantum-mechanical interaction-free measurement (IFM), in which the existence of an object in a given region of space may be determined seemingly without interacting with it.1,2 In the embodiment first proposed by Elitzur and Vaidman,3 a standard Michelson interferometer is aligned so that incident single photons (obtained in our experiment by using parametric downconversion; see Fig. 1) must exit by the same port in which they… Expand
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