Entanglement Induced Radiation Processes Which are First Order in Weak   Field
  Nonlinear processes of light scattering on a two-level system near resonance are considered. The problem is reduced to the emission and absorption of an entangled system, formed by a strong resonant field and a two-level system, having a non-factorizing wave function. 
M. L. Ter-Mikayelyan (Institute for Physical Research, Armenia)