Dark States and Coherent Control of Spin States in Molecular Magnets

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We propose a scheme to realize coherent control of spin states of molecule magnet, Ni₄. We introduce transverse magnetic fields with special frequencies. When the frequencies of transverse magnetic fields match in some conditions, we obtain dark states in Ni₄ molecules. Through adjusting the magnitude of magnetic fields, we can obtain any arbitrary superposition of the two ground spin states of Ni₄ molecules.