Entanglement between indirectly coupled modes in a coupled opto-magnomechanical system

In this paper, based on the mechanism of entanglement transfer, we propose and analyze several schemes for generating entanglement between indirectly coupled modes in an opto-magnomechanical system coupled with an additional auxiliary cavity. We mainly focus on understanding how the entanglement originating from optomechanical or magnomechanical entanglement sources distributes to the indirectly coupled subsystems. By comparing the efficiency of entanglement transfer under weak and strong optomechanical or magnomechanical couplings, we find strong couplings lead to more abundant indirect entanglement. Compared with other cases, optomechanical entanglement source can result in the strongest indirect entanglement. Meanwhile, the robustness of the indirect entanglement against the environmental temperature and the preparation of genuine tripartite entanglement for the indirectly coupled modes are also taken into account.