  We study the chaotic motion of an optomechanical system coupled to a
non-Markovian environment. We show that the environmental memory time can
significantly affect chaos in an enhancing way. In addition to classical
chaotic motion, the quantum entanglement in the presence of chaos is
investigated. It is found that both the environmental memory and chaos can lift
up bipartite entanglement in a non-linear optomechanical system. These
observations may help expand our understanding of the transition from classical
to quantum dynamics.
