Abstract

Optical quantum memory describes the process of on-demand storage and retrieval of single-photon-level quantum states, and is a critical enabling technology for many quantum applications. Memory bandwidth plays an important role in these applications, as it determines the pulse durations compatible with the memory and places an upper bound on the clock rate and processing speed of a quantum device. Here we present experimental results of an atomic barium quantum memory that enables storage and retrieval of ultra-broadband (>800 GHz) signal photons with high storage efficiency [95.6(3)%] and low noise [3.8(6) 10⁻⁵ noise photons].

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