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  Session: Labs/Apparatus
  Paper Type: Poster
  Title: Delayed-Choice Interference Experiment for the Entangled-Photon Undergraduate Laboratory*
  Meeting: 2018 Summer Meeting: Washington, DC
  Location: N/A
  Date:
  Time: 9:15PM
  Author: Enrique J. Galvez,, Colgate University,
3152287205, egalvez@colgate.edu
  Co-Author(s): Jhonny Castrillon,, Boris A. Rodriguez,, Omar Calderon-Losada,
  Abstract: We have developed a new undergraduate laboratory experiment with time-energy entangled photons that exploits the concept of delayed choice in quantum interference. Photon pairs produced by parametric down-conversion are entangled in energy and momentum. One photon is sent through a Mach-Zehnder interferometer. It reaches a detector immediately after exiting the interferometer. The energy-entangled partner is sent through a long optical fiber to an energy filter followed by a detector. The delayed-choice of filter bandwidth determines whether one sees interference or not. The experiment involves adding only a few optical components to an existing correlated-photon undergraduate laboratory. The experiment makes the students confront fundamental concepts of quantum interference.
  Footnotes: *NSF grant PHY-1506321
  Presentation: sm2018_GalvezDelayedChoicePoster.pdf

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