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Abstract: We demonstrate superradiant conversion between a two-mode collective atomicstate and a single-mode light field in an elongated cloud of Bose-condensedatoms. Two off-resonant write beams induce superradiant Raman scattering,producing two independent coherence gratings with a different wave vector inthe cloud. By applying phase-matched read beams after a controllable delay, thegratings can be selectively converted into the light field also in asuperradiant way. Due to the large cooperativity parameter and the smallvelocity width of the condensate, a high conversion efficiency of $> 70$ % anda long storage time of $> 120$ $\mu$s were achieved.



Author: Yutaka Yoshikawa, Kazuyuki Nakayama, Yoshio Torii, Takahiro Kuga

Source: https://arxiv.org/







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