Comment on "Deterministic Single-Photon Source for Distributed Quantum   Networking" by Kuhn, Hennrich, and Rempe
  I comment on the experiment to realize an "on-demand," reversible single-photon source by Kuhn, Hennrich, and Rempe [Phys. Rev. Lett. 89, 067901 (2002)]. 
H. J. Kimble