Quantum storage on subradiant states in an extended atomic ensemble

Details Quantum storage on subradiant states in an extended atomic ensemble Quantum storage on subradiant states in an extended atomic ensemble

2007-04-27

arxiv.org/abs/0704.3663v3

Phys. Rev. A 76, 043812 (2007)

Physics

Quantum Physics

V2: considerably revised (title, text). V3: minor changes - final version as published in PRA

Scientific paper

10.1103/PhysRevA.76.043812

A scheme for coherent manipulation of collective atomic states is developed such that total subradiant states, in which spontaneous emission is suppressed into all directions due to destructive interference between neighbor atoms, can be created in an extended atomic ensemble. The optimal conditions for creation of such states and suitability of them for quantum storage are discussed. It is shown that in order to achieve the maximum signal-to-noise ratio the shape of a light pulse to be stored and reconstructed using a homogeneously broadened absorbtion line of an atomic system should be a time-reversed regular part of the response function of the system. In the limit of high optical density, such pulses allow one to prepare collective subradiant atomic states with near flat spatial distribution of the atomic excitation in the medium.

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