  We first demonstrate theoretically that the computational quantum field
theory is equivalent to the quantum kinetic theory for pair creation in a
spatially homogeneous and time-dependent electric field, then verify
numerically their equivalence for pair creation in one-dimensional
time-dependent electric fields, and finally investigate detailedly the effects
of the field frequency, spatial width, pulse duration, and relative phase on
dynamically assisted Schwinger pair production in an inhomogeneous two-color
electric field. It is found that the enhancement effect of pair creation is
very sensitive to the field frequency and generally very obvious for a shorter
field width, a longer pulse duration, and a relative phase of maximizing the
field strength. These results can provide a significant reference for the
optimal control theory of pair creation which aims to maximize the created pair
yield within a given scope of field parameters.
