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

  title={Generation of pure-state single photons with high heralding efficiency by using a three-stage nonlinear interferometer},
  author={Jiamin Li and Jie Su and Liang Cui and Tianqi Xie and Z. Y. Ou and Xiaoying Li},
  journal={arXiv: Quantum Physics},
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… 

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