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Pure states are fundamental for the implementation of quantum technologies,and several methods for the purification of the state of a quantum system Shave been developed in the past years. In this letter we present a newapproach, based on the interaction of S with an auxiliary system P, having awide range of applicability. Considering two-level systems S and P and assuminga particular interaction between them, we prove that complete purifications canbe obtained under suitable conditions on the parameters characterizing P. Usinganalytical and numerical tools, we show that the purification process exhibitsa resonant behavior in both the cases of system isolated from the externalenvironment or not.Comment: 4 pages, LaTe

Resonant purification of mixed states for closed and open quantum systems