A solid-state light–matter interface at the single-photon level

@article{Riedmatten2008ASL,
  title={A solid-state light–matter interface at the single-photon level},
  author={Hugues de Riedmatten and Mikael Afzelius and Matthias U. Staudt and Christoph Simon and Nicolas Gisin},
  journal={Nature},
  year={2008},
  volume={456},
  pages={773-777}
}
Coherent and reversible mapping of quantum information between light and matter is an important experimental challenge in quantum information science. In particular, it is an essential requirement for the implementation of quantum networks and quantum repeaters. So far, quantum interfaces between light and atoms have been demonstrated with atomic gases, and with single trapped atoms in cavities. Here we demonstrate the coherent and reversible mapping of a light field with less than one photon… 
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