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Russian scientists have developed a theoretical model of quantum memory for light, adapting the concept of a hologram to a quantum system. These findings from Anton Vetlugin and Ivan Sokolov from St. Petersburg State University in Russia are published in a study in EPJ D ("Addressable parallel cavity-based quantum memory").

The authors demonstrate for the first time that it is theoretically possible to retrieve, on demand, a given portion of the stored quantised light signal of a holographic image - set in a given direction in a given position in time sequence. This is done by shaping the control field both in space and time. The ultimate goal is to introduce into quantum holograms the ability not only to store quantum signals but also to perform transformations of their quantum states - an approach useful for quantum communication and computation.

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