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Theoretical analyses of the fluctuation properties of photo-
current are derived. By the quantum theory of light, the noise
reduction due to squeezing is explained as a manifestation of
the memory effect of photoelectron counting process. It is
found that the more the light is squeezed, the larger the
memory effect is. Both photon number squeezing and quadrature
squeezing are considered. Several parameters are used to model
quantum state of light, especially the squeezed coherent light.
The quantitative connection between its photon number/
quadrature variance and its photocurrent noise spectrum is
established.
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