  The dynamics of a chain of three spins coupled at both ends to separate
bosonic baths at different temperatures is studied. An exact analytical so-
lution of the master equation in the Born-Markov approximation for the reduced
density matrix of the chain is constructed. It is shown that for long times the
reduced density matrix converges to the non-equilibrium steady- state.
Dynamical and steady state properties of the concurrence between the first and
the last spin are studied.
