Foundations of Physics

, Volume 23, Issue 7, pp 987-997

First online:

Quantum mechanical interaction-free measurements

  • Avshalom C. ElitzurAffiliated withSchool of Physics and Astronomy, Tel-Aviv Universitythe Department of Chemical Physics, The Weizmann Institute of Science
  • , Lev VaidmanAffiliated withSchool of Physics and Astronomy, Tel-Aviv University

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A novel manifestation of nonlocality of quantum mechanics is presented. It is shown that it is possible to ascertain the existence of an object in a given region of space without interacting with it. The method might have practical applications for delicate quantum experiments.