Frontiers of Optoelectronics

, Volume 11, Issue 2, pp 148–154 | Cite as

Franson interferometry with a single pulse

  • Eric Y. ZhuEmail author
  • Costantino Corbari
  • Alexey V. Gladyshev
  • Peter G. Kazansky
  • Li Qian
Research Article Invited Paper, Special Issue—Photonics Research in Canada


In classical optics, interference occurs between two optical fields when they are indistinguishable from one another. The same holds true in quantum optics, where a particular experiment, the Franson interferometer, involves the interference of a photon pair with a time-delayed version of itself. The canonical version of this interferometer requires that the time delay be much shorter than the coherence length of the pump used to generate the photon pair, so as to guarantee indistinguishability. However, when this time delay is comparable to the coherence length, conventional wisdom suggests that interference visibility degrades significantly. In this work, though, we show that the interference visibility can be restored through judicious temporal post-selection. Utilizing correlated photon pairs generated by a pump whose pulsewidth (460 ps) is shorter than the interferometer’s time delay (500 ps), we are able to observe a fringe visibility of 97.4±4.3%. We believe this new method can be used for the encoding of high-dimensional quantum information in the temporal domain.


quantum optics quantum interference nonlinear optics optical fibers 


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Copyright information

© Higher Education Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Eric Y. Zhu
    • 1
    Email author
  • Costantino Corbari
    • 2
  • Alexey V. Gladyshev
    • 3
  • Peter G. Kazansky
    • 2
  • Li Qian
    • 1
  1. 1.Department of Electrical and Computer EngineeringUniversity of TorontoTorontoCanada
  2. 2.Optoelectronics Research CentreUniversity of SouthamptonSouthamptonUK
  3. 3.Fiber Optics Research Center of the Russian Academy of SciencesMoscowRussia

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