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Quantum feedback control is a technology which can be used to drive a quantumsystem into a predetermined eigenstate. In this article, sufficient conditionsfor the experiment parameters of a quantum feedback control process of ahomodyne QND measurement are given to guarantee feedback control of a spin-1/2quantum system in case of imperfect detection efficiency. For the case of purestates and perfect detection efficiency, time scales of feedback controlprocesses are calculated.Comment: 6 pages, 3 figure

Global stability criterion for a quantum feedback control process on a single qubit and exponential stability in case of perfect detection efficiency