High-efficiency quantum interrogation measurements via the quantum zeno effect

P. G. Kwiat, A. G. White, J. R. Mitchell, O. Nairz, G. Weihs, H. Weinfurter, A. Zeilinger

Research output: Contribution to journalArticlepeer-review


The phenomenon of quantum interrogation allows one to optically detect the presence of an absorbing object, without the measuring light interacting with it. In an application of the quantum Zeno effect, the object inhibits the otherwise coherent evolution of the light, such that the probability that an interrogating photon is absorbed can in principle be arbitrarily small. We have implemented this technique, achieving efficiencies of up to 73%, and consequently exceeding the 50% theoretical maximum of the original “interaction-free” measurement proposal. We have also predicted and experimentally verified a previously unsuspected dependence on loss. 1999

Original languageEnglish (US)
Pages (from-to)4725-4728
Number of pages4
JournalPhysical review letters
Issue number15
StatePublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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