Abstract
Abstract This chapter describes the basic features of open quantum systems, i.e. quantum systems that are affected by noise due to uncontrollable degrees of freedom of an environment or bath. This noise is responsible for effects such as dissipation,decoherence and irreversibility. We study the equilibrium states of open quantum systems and review tools from quantum measurement theory, which describe how to theory, that describe how to extract information from an (open) quantum system. We generalize these tools to multimulti-time statistics and define the notion of a quantum stochastic process and a quan tum Markov process. Finally, we study in which cases a quantum stochastic process looks classical.
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