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This article presents microscopic derivation of the Kraus operators for (thegeneralized) amplitude and phase damping process. Derivation is based on therecently developed method [Andersson et al, J. Mod.Opt. 54, 1695 (2007)] whichconcerns finite dimensional systems (e.g. qubit). The form of these operatorsis usually estimated without insight into the microscopic details of thedynamics. The behavior of the qubit dynamics is simulated and depicted viaBloch sphere change.

Microscopic derivation of the one qubit Kraus operators for amplitude and phase damping