  An efficient method to coherently control the waveforms of gamma-photons has
been proposed and experimentally realized. It is based on the resonant
interaction of gamma-photons with an ensemble of nuclei with modulated
frequency of the quantum transition. In particular, the temporal compression of
an individual gamma-photon into coherent ultrashort pulse train has been
demonstrated. The developed technique is expected to give a strong impetus on
emerging fields of coherent and quantum gamma-optics, providing a basis for
realization of the gamma-photon nuclear-ensemble interfaces and quantum
interference effects at the nuclear gamma-ray transitions.
