>VITAE:
Mario Ziman studied mathematical physics in Comenius University in Bratislava. Currently he is working as a postdoc in the Research Center for Quantum Information
in Bratislava in the group of prof. Vladimir Buzek. Mario Ziman is interested in mathematical structures of quantum objects, conceptual questions of quantum theory, quantum tomography, quantum dynamics and quantum communication.

We will study two simple collision models describing decoherence and so-called homogenization process (“exponential decay”).
After the specification of all possible interactions that corresponds to such models we will discuss the entanglement behavior.
Altough the models are intrinsically discrete in time one can derive an effective master equation. It turns out that arbitrary master equation can be understand as a collison model.