Generation of pure-state single photons with high heralding efficiency by using a three-stage nonlinear interferometer

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  • Jiamin Li
  • Jie Su
  • Liang Cui
  • Tianqi Xie
  • Xiaoying Li


Original languageEnglish
Article number204002
Journal / PublicationApplied Physics Letters
Issue number20
Online published21 May 2020
Publication statusPublished - May 2020
Externally publishedYes


We experimentally study a fiber-based three-stage nonlinear interferometer and demonstrate its application in generating heralded single photons with high efficiency and purity by spectral engineering. We obtain a heralding efficiency of 90% at a brightness of 0.039 photons/pulse. The purity of the source is checked by two-photon Hong-Ou-Mandel interference with a visibility of 95 ± 6 % (after correcting Raman scattering and multi-pair events). Our investigation indicates that the heralded source of single photons produced by the three-stage nonlinear interferometer has the advantages of high purity, high heralding efficiency, high brightness, and flexibility in wavelength and bandwidth selection.

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