Light speed reduction to 17 metres per second in an ultracold atomic gas

@article{Hau1999LightSR,
  title={Light speed reduction to 17 metres per second in an ultracold atomic gas},
  author={Lene Vestergaard Hau and Sarah E. Harris and Zachary Dutton and Cyrus H Behroozi},
  journal={Nature},
  year={1999},
  volume={397},
  pages={594-598}
}
Techniques that use quantum interference effects are being actively investigated to manipulate the optical properties of quantum systems. One such example is electromagnetically induced transparency, a quantum effect that permits the propagation of light pulses through an otherwise opaque medium. Here we report an experimental demonstration of electromagnetically induced transparency in an ultracold gas of sodium atoms, in which the optical pulses propagate at twenty million times slower than… 
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