  In this paper we study the time evolution of the entanglement between two
remote NV Centers (nitrogen vacancy in diamond) connected by a dual-mode
nanomechanical resonator with magnetic tips on both sides. Calculating the
negativity as a measure for the entanglement, we find that the entanglement
between two spins oscillates with time and can be manipulated by varying the
parameters of the system. We observed the phe- nomenon of a sudden death and
the periodic revivals of entanglement in time. For the study of quantum deco-
herence, we implement a Lindblad master equation. In spite of its complexity,
the model is analytically solvable under fairly reasonable assumptions, and
shows that the decoherence influences the entanglement, the sudden death, and
the revivals in time.
