在室温碱金属蒸气中制备窄速度分布的量子存储器
Preparing Narrow Velocity Distributions for Quantum Memories in Room-Temperature Alkali Vapours
摘要：
量子存储器是通过概率操作同步实现大规模量子网络的关键技术。这种网络对量子存储器提出了严格的要求，如存储时间，检索效率，带宽和可扩展性。在热原子蒸气平台上的共振和非共振梯形协议是有希望的候选人，结合了高效的高带宽操作和低噪声按需检索。然而，它们的存储时间受到由组成蒸汽的原子的宽速度分布引起的运动诱导失相的严重限制。在本文中，我们展示了速度选择性光泵浦，以克服这种退相干机制。这将增加蒸汽存储器的可实现的存储器存储时间。该技术也可用于制备任意形状的吸收轮廓，例如，制备原子频率梳吸收特征。
英文摘要：
Quantum memories are a crucial technology for enabling large-scale quantum networks through synchronisation of probabilistic operations. Such networks impose strict requirements on quantum memory, such as storage time, retrieval efficiency, bandwidth, and scalability. On- and off-resonant ladder protocols on warm atomic vapour platforms are promising candidates, combining efficient high-bandwidth operation with low-noise on-demand retrieval. However, their storage time is severely limited by motion-induced dephasing caused by the broad velocity distribution of atoms comprising the vapour. In this paper, we demonstrate velocity selective optical pumping to overcome this decoherence mechanism. This will increase the achievable memory storage time of vapour memories. This technique can also be used for preparing arbitrarily shaped absorption profiles, for instance, preparing an atomic frequency comb absorption feature.
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