  We propose inverse renormalization group transformations within the context
of quantum field theory that produce the appropriate critical fixed point
structure, give rise to inverse flows in parameter space, and evade the
critical slowing down effect in calculations pertinent to criticality. Given
configurations of the two-dimensional $\phi^{4}$ scalar field theory on sizes
as small as $V=8^{2}$, we apply the inverse transformations to produce rescaled
systems of size up to $V'=512^{2}$ which we utilize to extract two critical
exponents. We conclude by discussing how the approach is generally applicable
to any method that successfully produces configurations from a statistical
ensemble and how it can give novel insights into the structure of the
renormalization group.
