Properties of a single photon generated by a solid-state emitter:   effects of pure dephasing
  We investigate the properties of a single photon generated by a solid-state emitter subject to strong pure dephasing. We employ a model in which all the elements of the system, including the propagating fields, are treated quantum mechanically. We analytically derive the density matrix of the emitted photon, which contains full information about the photon, such as its pulse profile, power spectrum, and purity. We visualize these analytical results using realistic parameters and reveal the conditions for maximizing the purity of generated photons. 
Eiki Iyoda, Takeo Kato, Takao Aoki, Keiichi Edamatsu, Kazuki Koshino
quant-ph