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In this paper, we examined a possibility of preservation of a substantiallymultimode radiation in a single cell of quantum memory. As a light source weconsidered a synchronously pumped optical parametric oscillator (SPOPO). As itwas shown in [1-4], SPOPO radiation has a large number of the correlated modesmaking it attractive for the purposes of the quantum communication andcomputing. We showed that these correlations can be mapped on the longitudinalspin waves of the memory cell and be restored later in the readout light. Theefficiencies of the writing and readout depend on the mode structure of thememory determined by a mechanism of the light-matter interaction underconsideration (the non-resonance Raman interaction) and by the profile of thedriving light field. We showed that like the initial light pulse train, therestored one can be represented by a set of squeezed supermodes. The mapping ofthe quantum multimode correlations on the material medium offers opportunitiesto manipulate the quantum states within the memory cell followed by the readingof the transformed state.

Preservation of quantum correlations in femtosecond light pulse train within atomic ensemble