  Entanglement is essential in quantum information science. Typically, the
inevitable coupling between quantum systems and environment inhibits
entanglement from being created between long-distance subsystems and being
maintained for a long time. In this paper, we show that when the environment is
composed of a bath of massive scalar fields, the region of the separation
within which entanglement can be generated is significantly enlarged, and the
decay rate of entanglement is significantly slowed down compared with those in
the massless case, when the mass of the field $m$ is smaller than but close to
the transition frequency of the qubits $\omega$. When $m\geq\omega$, the
initial entanglement can be maintained for an arbitrarily long time, regardless
of the environmental temperature. Therefore, in principle, it is possible to
achieve long-distance entanglement generation and long-lived entanglement by
manipulating the energy level spacing of the two-level systems with respect to
the mass of the field.
