Abstract
The methods for storage and reconstruction of quantum information in a crystal with impurity ∧ atoms are studied in the case when the upper state is located in the exciton band. The upper level of the impurity atom forms a Fano resonant state similar to the autoionization atomic state due to the configuration interaction with the continuum of the exciton band. The slowing of light pulses is realized in the presence of a control field, so that the group velocity appears much lower than the velocity of light in vacuum. The processes are considered in the adiabatic limit of the field activation. The possibility for the storage and reconstruction of a quantum pulse is studied in the case of the instantaneous on-off switching of the control field. It is demonstrated that the shape and quantum state of the light pulse are preserved in the case of its propagation and reconstruction. The polariton states are obtained and their properties are studied for the case of transitions through the exciton resonance.
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