Experimental Realization of Wheeler's Delayed-Choice Gedanken Experiment

  title={Experimental Realization of Wheeler's Delayed-Choice Gedanken Experiment},
  author={Vincent Jacques and E Wu and Fr{\'e}d{\'e}ric Grosshans and François Treussart and Philippe Grangier and Alain Aspect and Jean-François Roch},
  pages={966 - 968}
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… 

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