Abstract
Macroscopic spin superpositions in optically thick atomic ensembles are essential for quantum optical information storage and retrieval and for sensitive magnetometry. Being able to control them and master their coupling to light is thus of paramount importance. In 2002, André et al. [1] proposed a scheme to perform Bragg scattering of spin waves using electromagnetically induced transparency (EIT). Observing the diffracted modes was however proven challenging due to the requirements on the atomic ensemble temperature and the lack of direct read-out procedures. An alternative for realising Bragg scattering of spin waves is via photon echo based memories with prominant techniques such as the gradient echo memory (GEM) [3] and the two-pulse photon echo [2].
© 2015 IEEE
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