Spectral compression of single-photon-level laser pulse

@article{Li2017SpectralCO,
  title={Spectral compression of single-photon-level laser pulse},
  author={Yuan-hua Li and Tong Xiang and Yi-you Nie and Ming-huang Sang and Xianfeng Chen},
  journal={Scientific Reports},
  year={2017},
  volume={7}
}
We experimentally demonstrate that the bandwidth of single photons laser pulse is compressed by a factor of 58 in a periodically poled lithium niobate (PPLN) waveguide chip. A positively chirped single photons laser pulse and a negatively chirped classical laser pulse are employed to produce a narrowband single photon pulse with new frequency through sum-frequency generation. In our experiment, the frequency and bandwidth of single photons at 1550 nm are simultaneously converted. Our results… 

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