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In a scheme of nonadiabatic purely geometric quantum gates in nuclearmagnetic resonance(NMR) systems we propose proper magnitudes of magnetic fieldsthat are suitable for an experiment. We impose a natural condition and reducethe degree of freedom of the magnetic fields to the extent. By varying themagnetic fields with essentially one-dimensional degree of freedom, any spinstate can acquire arbitrary purely geometric phase\phi_{g}=-2\pi(1-cos{theta}), 0 < cos{\theta} < 1. This is an essentialingredient for constructing universal geometric quantum gates.Comment: LaTeX, 4page

Proper magnetic fields for nonadiabatic geometric quantum gates in NMR