Efficient, Broad Bandwidth Quantum Memory in Neutral Atomic Barium
Quantum memory -- the ability to store and retrieve photonic quantum states on-demand -- is an important primitive technology for photonic quantum applications. We report record storage efficiencies in the first atomic THz-bandwidth quantum memory. We present a novel Near-Off-Resonant Memory (NORM) quantum memory protocol in collisionally broadened hot atomic barium vapor, which we use to achieve 86% storage efficiency, 25% total efficiency, a time-bandwidth-product of 800, and single-photon fidelity of 0.9995. This work presents a solution to the efficiency-bandwidth tradeoff problem in atomic quantum memory.
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