  We investigate the correspondence between the decay of correlation in
classical system, governed by Ruelle--Pollicott resonances, and the properties
of the corresponding quantum system. For this purpose we construct classical
systems with controllable resonances together with their quantum counterpart.
As an application of such tailormade resonances we reveal the role of
Ruelle--Pollicott resonances for the localization properties of quantum energy
eigenstates.
