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Experimental Realization of Wheeler's Delayed-Choice Gedanken Experiment

Vincent Jacques, E. Wu, Frédéric Grosshans, François Treussart, Philippe Grangier, Alain Aspect and Jean-François Roch
Science
New Series, Vol. 315, No. 5814 (Feb. 16, 2007), pp. 966-968
Stable URL: http://www.jstor.org/stable/20039007
Page Count: 3
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Experimental Realization of Wheeler's Delayed-Choice Gedanken Experiment
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Abstract

Wave-particle duality is strikingly illustrated by Wheeler's delayed-choice gedanken experiment, where the configuration of a two-path interferometer is chosen after a single-photon pulse has entered it: Either the interferometer is closed (that is, the two paths are recombined) and the interference is observed, or the interferometer remains open and the path followed by the photon is measured. We report an almost ideal realization of that gedanken experiment with single photons allowing unambiguous which-way measurements. The choice between open and closed configurations, made by a quantum random number generator, is relativistically separated from the entry of the photon into the interferometer.

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