LANGEVIN EQUATION FOR THE SQUEEZING OF LIGHT BY MEANS OF A 
          PARAMETRIC OSCILLATOR - COMMENT

P. Kinsler, P.D. Drummond.

    Department of Physics
    University of Queensland
    Queensland 4072
    Australia

    Phys. Rev. A 44, 7848 (1991). 

We comment on statements made about quantum representation theory
in the paper by T.W. Marshall and E. Santos [Phys. Rev.  A 41,
1582 (1990)]. Results are presented which show that correct
results can be obtained from Langevin equations derived from the
positive-P representation, even when those obtained by truncation
of the Wigner time-evolution equation give incorrect results.  






Email: Dr.Paul.Kinsler@physics.org