Complementarity and the quantum eraser

Thomas J. Herzog, Paul G. Kwiat, Harald Weinfurter, Anton Zeilinger

Research output: Contribution to journalArticlepeer-review


We present various experiments demonstrating the mutual exclusivity of observing interference and which-path information, as demanded by Bohr's complementarity principle. Using photon pairs created in parametric down-conversion, no which-path measurements need to be performed on the interfering photon itself. Instead the other photon can be used to introduce distinguishability, which consequently destroys interference. However, a suitable measurement erases this distinguishability and interference can be recovered.

Original languageEnglish (US)
Pages (from-to)3034-3037
Number of pages4
JournalPhysical review letters
Issue number17
StatePublished - 1995
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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