冷铯原子的快速长距离输运
Fast long-distance transport of cold cesium atoms
摘要：
在真空系统的远距离部分之间传输冷原子是许多量子模拟实验的核心内容，特别是在需要大型光学通道和精确控制磁场的设置中。在这项工作中，我们证明了冷铯原子的光传输的总传输距离约为$43\,$厘米在小于$30\,$毫秒。高速度是由移动的晶格，这是通过贝塞尔和高斯激光束的干涉产生的促进。我们在几个$μ$ K的温度下传输了大约$3\times 10^6$原子，传输效率大约为$75\%$。我们提供了一个详细的研究不同的加速度和晶格深度的输运效率，发现输运效率主要是由沿重力方向的潜在深度的限制。为了突出量子模拟实验的光学传输设置的适用性，我们演示了约$2\times 10^4$原子的纯玻色-爱因斯坦凝聚体的产生。我们发现一个强大的最终原子数在$2\%$超过$2.5\,$ h的持续时间与$<5\%$之间的个人实验实现的标准偏差。
英文摘要：
Transporting cold atoms between distant sections of a vacuum system is a central ingredient in many quantum simulation experiments, in particular in setups, where a large optical access and precise control over magnetic fields is needed. In this work, we demonstrate optical transport of cold cesium atoms over a total transfer distance of about $43\,$cm in less than $30\,$ms. The high speed is facilitated by a moving lattice, which is generated via the interference of a Bessel and a Gaussian laser beam. We transport about $3\times 10^6$ atoms at a temperature of a few $μ$K with a transport efficiency of about $75\%$. We provide a detailed study of the transport efficiency for different accelerations and lattice depths and find that the transport efficiency is mainly limited by the potential depth along the direction of gravity. To highlight the suitability of the optical-transport setup for quantum simulation experiments, we demonstrate the generation of a pure Bose-Einstein condensate with about $2\times 10^4$ atoms. We find a robust final atom number within $2\%$ over a duration of $2.5\,$h with a standard deviation of $<5\%$ between individual experimental realizations.
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