Room Temperature Atomic Frequency Comb Memory for Light

Abstract

We demonstrate coherent storage and retrieval of pulsed light using the atomic frequency comb quantum memory protocol in a room temperature alkali vapour. We utilise velocity-selective optical pumping to prepare multiple velocity classes in the $F=4$ hyperfine ground state of caesium. The frequency spacing of the classes is chosen to coincide with the $F^{\prime }=4-F^{\prime }=5$ hyperfine splitting of the $6^2$P${}_{3/2}$ excited state resulting in a broadband periodic absorbing structure consisting of two usually Doppler-broadened optical transitions. Weak coherent states of duration $2\mathrm{ns}$ are mapped into this atomic frequency comb with pre-programmed recall times of $8\mathrm{ns}$ and $12\mathrm{ns}$, with multi-temporal mode storage and recall demonstrated. Utilising two transitions in the comb leads to an additional interference effect upon rephasing that enhances the recall efficiency.

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