  We investigate the quantum properties of fields generated by resonantly
enhanced wave mixing based on atomic coherence in Raman systems. We show that
such a process can be used for generation of pairs of Stokes and anti-Stokes
fields with nearly perfect quantum correlations, yielding almost complete (i.e.
100%) squeezing without the use of a cavity.
  We discuss the extension of the wave mixing interactions into the domain of a
few interacting light quanta.
