Quantum key distribution over 30km of standard fiber using energy-time   entangled photon pairs: a comparison of two chromatic dispersion reduction   methods
  We present a full implementation of a quantum key distribution system using energy-time entangled photon pairs and functioning with a 30km standard telecom fiber quantum channel. Two bases of two orthogonal states are implemented and the setup is quite robust to environmental constraints such as temperature variation. Two different ways to manage chromatic dispersion in the quantum channel are discussed. 
Sylvain Fasel, Nicolas Gisin, Gr\'egoire Ribordy, Hugo Zbinden