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Frontiers in Optics

Four-photon light-atom interface based on Raman scattering for quantum memories and telecommunication

Michal P. Parniak, Wojciech Wasilewski

Published Jan 1, 2015• 0 citations
Publisher

Abstract

We report first experimental realization of an atom-light interface based on four-photon Raman interaction. We are able to couple light resonant to excited state transition and ground-state atomic coherence using a single warm atomic ensemble.
DOI
10.1364/fio.2015.fw6b.6

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We demonstrate an interface between light coupled to transition between excited states of rubidium and long-lived ground-state atomic coherence. In our proof-of-principle experiment a non-linear process of four-wave mixing in an open-loop configuration is used to achieve light emission proportional to independently prepared ground-state atomic coherence. We demonstrate strong correlations between Raman light heralding generation of ground-state coherence and the new four-wave mixing signal. Dependance of the efficiency of the process on laser detunings is studied.
A scheme of photon echo-based quantum memory in the optimal optical QED cavity with off-resonant Raman atomic transition is proposed. The scheme employs the atomic ensembles characterized by an optically thin resonant transition and natural inhomogeneous broadening of the resonant line composed of the arbitrary narrow homogeneous spectral components. The scheme provides robust and quite simple coherent control of the light atoms dynamics that can be implemented by using an existing optical technique and opens a practical way for realization of the efficient long-lived multimode optical quantum memory.
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