The meaning of the interaction-free measurements

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Interaction-free measurements introduced by Elitzur and Vaidman [Found. Phys. 23, 987 (1993)] allow finding infinitely fragile objects without destroying them. Many experiments have been successfully performed showing that indeed, the original scheme and its modifications lead to reduction of the disturbance of the observed systems. However, there is a controversy about the validity of the term "interaction-free" for these experiments. Broad variety of such experiments are reviewed and the meaning of the interaction-free measurements is clarified.

Original languageEnglish
Pages (from-to)491-510
Number of pages20
JournalFoundations of Physics
Issue number3
StatePublished - Mar 2003


  • Interaction-free measurements
  • Quantum measurements


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