  We explore the quantization of a $(1+1)$-dimensional inhomogeneous scalar
field theory in which Poincar\'{e} symmetry is explicitly broken. We show the
`classical equivalence' between a scalar field theory on curved spacetime
background and its corresponding inhomogeneous scalar field theory. This
implies that a hidden connection may exist among some inhomogeneous field
theories, which corresponds to general covariance in field theory on curved
spacetime. Based on the classical equivalence, we propose how to quantize a
specific field theory with broken Poincar\'{e} symmetry inspired by standard
field theoretic approaches, canonical and algebraic methods, on curved
spacetime. Consequently, we show that the Unruh effect can be realized in
inhomogeneous field theory and propose that it may be tested by a condensed
matter experiment. We suggest that an algebraic approach is appropriate for the
quantization of a generic inhomogeneous field theory.
