Femtosecond Time-Bin Entangled Qubits for Quantum Communication
  We create pairs of non-degenerate time-bin entangled photons at telecom wavelengths with ultra-short pump pulses. Entanglement is shown by performing   Bell kind tests of the Franson type with visibilities of up to 91%. As time-bin entanglement can easily be protected from decoherence as encountered in optical fibers, this experiment opens the road for complex quantum communication protocols over long distances. We also investigate the creation of more than one photon pair in a laser pulse and present a simple tool to quantify the probability of such events to happen. 
Ivan Marcikic, Hugues de Riedmatten, Wolfgang Tittel, Valerio Scarani,   Hugo Zbinden and Nicolas Gisin