  We propose a method to enhance bipartite and tripartite entanglement in
cavity magnomechanics using an optical parametric amplifier (OPA). We analyze
this system and identified parametric regimes where different types of
entanglement are enhanced. We show that a proper choice of the phase of the
parametric amplifier leads to the enhancement of the bipartite entanglements.
Moreover, the tripartite entanglement is also significantly enhanced in the
presence of OPA. The OPA not only enhances the strength of entanglement but
also increases the domain of entanglement over a wider space of detunings as
compared to the system when no OPA is present. Similarly, the robustness of
entanglement against temperature is also enhanced. Another important
consequence of OPA is the fact that it relaxes the requirement of strong
magnon-phonon coupling to generate cavity-magnon entanglement which is
necessary for the case when OPA is not present. We believe that the presented
scheme is a step forward to realize robust quantum entanglement using current
technology.

Quantum Physics