Abstract
A spin particle subjected to any time-dependent magnetic field isinvestigated in detail at different magnetic field configurations. Spin flipprobability, spin alignment, cyclic and noncyclic nonadiabatic geometricphases are calculated exactly and their analytical expressions are presented.Our theoretical study shows that a spin particle controlled by a resonanttime-dependent magnetic field can be used as efficient controllable devicesof spin switch or qubit register.
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