It is examined the coherence properties between the Stokes and anti-Stokes fields and its application in Communication. It is proposed novel two-photon entangled sources which take into account the coherence and collective phenomena between these fields. The quantum propriety of realistic sources of powerful coherent bi-boson radiation (coherent entanglement of Stokes and anti- Stokes photons) is analyzed. The possibility of experimental applications of coherence between the Stokes and anti-Stokes photons in quantum communications and cryptography is proposed.