  We present a scheme to deterministically prepare non-classical quantum states
of a massive mirror including highly non-Gaussian states exhibiting sizeable
negativity of the Wigner function. This is achieved by exploiting the
non-linear light-matter interaction in an optomechanical cavity by driving the
system with optimally designed frequency patterns. Our scheme reveals to be
resilient against mechanical and optical damping, as well as mechanical thermal
noise and imperfections in the driving scheme. Our proposal thus opens a
promising route for table-top experiments to explore and exploit macroscopic
quantum phenomena.
