  A compact scheme for the preparation of macroscopic multipartite entanglement
is proposed and analyzed. In this scheme the vibrational modes of a mechanical
resonator constitute continuous variable (CV) subsystems that entangle to each
other as a result of their interaction with a two-level system (TLS). By
properly driving the TLS, we show that a selected set of modes can be activated
and prepared in a multipartite entangled state. We first study entanglement
properties of a three-mode system by evaluating the genuine multipartite
entanglement. And investigate its usefulness as a quantum resource by computing
the quantum Fisher information. Moreover, the robustness of the state against
the qubit and thermal noises is studied, proving a long-lived entanglement. To
examine the scalability and structural properties of the scheme, we derive an
effective model for the multimode system through elimination of the TLS
dynamics. This work provides a step towards a compact and versatile device for
creating multipartite noise-resilient entangled state in vibrational modes as a
resource for CV quantum metrology, quantum communication, and quantum
computation.
