Simple protocol for secure decoy-state quantum key distribution with a loosely controlled source

@article{Wang2007SimplePF,
  title={Simple protocol for secure decoy-state quantum key distribution with a loosely controlled source},
  author={Xiang‐Bin Wang and Cheng-Zhi Peng and Jian-Wei Pan},
  journal={Applied Physics Letters},
  year={2007},
  volume={90},
  pages={031110}
}
The method of decoy-state quantum key distribution requests different intensities of light pulses. Existing theory has assumed exact control of intensities. Here the authors propose a simple protocol which is secure and efficient even there are errors in intensity control. In their protocol, decoy pulses and signal pulses are generated from the same father pulses with a two-value attenuation. Given the upper bound of fluctuation of the father pulses, their protocol is secure provided that the… 
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