  We introduce a technique to store and manipulate single x-ray photons which
relies on dynamically controlled absorption via nuclear hyperfine magnetic
splitting. This scheme is inherently suitable for storage, on-demand generation
and dynamical manipulation of single x-ray photons, for instance, the
manipulation of the temporal shape, temporal splitting, the interference
between x-ray photons and the control of the polarization. Our approach opens
up new paths in x-ray quantum information.
