  We propose experimental methods to engineer reservoirs at arbitrary
temperature which are feasible with current technology. Our results generalize
to mixed states the possibility of quantum state engineering through controlled
decoherence. Finite temperature engineered reservoirs can lead to the
experimental observation of thermal entanglement --the appearance and increase
of entanglement with temperature-- to the study of the dependence of finite
time disentanglement and revival with temperature, quantum thermodynamical
effects, among many other applications, enlarging the comprehension of
temperature dependent entanglement properties.
