Two-photon franson-type experiments and local realism

Sven Aerts, Paul Kwiat, Jan Åke Larsson, Marek Żukowski

Research output: Contribution to journalArticlepeer-review


The two-photon interferometric experiment proposed by J. D. Franson [Phys. Rev. Lett. 62, 2205 (1989)] is often treated as a “Bell test of local realism.” However, it has been suggested that this is incorrect due to the 50% postselection performed even in the ideal gedanken version of the experiment. Here we present a simple local hidden variable model of the experiment that successfully explains the results obtained in usual realizations of the experiment, even with perfect detectors. Furthermore, we also show that there is no such model if the switching of the local phase settings is done at a rate determined by the internal geometry of the interferometers.

Original languageEnglish (US)
Pages (from-to)2872-2875
Number of pages4
JournalPhysical review letters
Issue number15
StatePublished - Jan 1 1999
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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