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Microscopic Hamiltonian models of the composite system "open system +environment" typically do not provide the operator-sum Kraus form of the opensystem's dynamical map. With the use of a recently de- veloped method [16], wederive the Kraus operators starting from the mi- croscopic Hamiltonian model,i.e. from the proper master equation, of the one-qubit depolarizing channel.Those Kraus operators generalize the stan- dard counterparts, which are widelyused in the literature. Comparison of the standard and the here obtained Krausoperators is performed via inves- tigating dynamical change of the Bloch spherevolume, entropy production and the open system's state trace distance. We findthat the standard depo- larizing channel is more deteriorating than thegeneralized one.

Generalized Kraus operators for the one-qubit depolarizing quantum channel