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Large-scale quantum networks require quantum memories featuring long-livedstorage of non-classical light together with efficient, high-speed and reliableoperation. The concurrent realization of these features is challenging due toinherent limitations of matter platforms and light-matter interactionprotocols. Here, we propose an approach to overcome this obstacle, based on theimplementation of the Autler-Townes-splitting (ATS) quantum-memory protocol ona Bose-Einstein condensate (BEC) platform. We demonstrate a proof-of-principleof this approach by storing short pulses of single-photon-level light as acollective spin-excitation in a rubidium BEC. For 20 ns long-pulses, we achievean ultra-low-noise memory with an efficiency of 30% and lifetime of 15 $\mu$s.The non-adiabatic character of the ATS protocol (leading to high-speed andlow-noise operation) in combination with the intrinsically large atomicdensities and ultra-low temperatures of the BEC platform (offering highlyefficient and long-lived storage) opens up a new avenue towardshigh-performance quantum memories.

Storing short single-photon-level optical pulses in Bose-Einstein condensates for high-performance quantum memory