Ultra-coherent single photon source
  We present a novel type of single photon source in solid state, based on the coherent laser light scattering by a single InAs quantum dot. We demonstrate that the coherence of the emitted single photons is tailored by the resonant excitation with a spectral linewidth below the radiative limit. Our ultra-coherent source opens the way for integrated quantum devices dedicated to the generation of single photons with high degrees of indistinguishability. 
Hai Son Nguyen, Gregory Sallen, Christophe Voisin, Philippe   Roussignol, Carole Diederichs and Guillaume Cassabois
cond-mat.mes-hall