碰撞玻色-爱因斯坦准凝聚体中散射原子的对关联
Pair correlation of atoms scattered from colliding Bose-Einstein quasicondensates
摘要：
玻色-爱因斯坦凝聚体的碰撞是单个非经典关联原子对的有用来源。在这里，我们考虑弹性散射的原子从细长的云考虑到一个有效的，有限的持续时间的碰撞由于膨胀的凝聚。此外，我们包括准凝聚性质的简并量子气体，由于系统的有限温度。我们评估的对关联函数实验测量K。V. Kheruntsyan，et.等，Phys. Rev. Lett. 108，260401（2012）中所述。我们表明，碰撞的有限持续时间是一个重要的因素，确定的相关性的属性。我们的分析计算与测量结果是一致的。我们提供的分析模型，用于识别物理过程的影响的相关性，是相关的实验与非经典的原子对。
英文摘要：
A collision of Bose-Einstein condensates is a useful source of single nonclassically correlated pairs of atoms. Here, we consider elastic scattering of atoms from elongated clouds taking into account an effective, finite duration of the collision due to the expansion of the condensates. Also, we include the quasicondensate nature of the degenerate quantum gases, due to a finite temperature of the system. We evaluate the pair correlation function measured experimentally in K. V. Kheruntsyan, et. al. Phys. Rev. Lett. 108, 260401 (2012). We show that the finite duration of the collision is an important factor determining the properties of the correlations. Our analytic calculations are in agreement with the measurements. The analytical model we provide, useful for identifying physical processes that influence the correlations, is relevant for experiments with nonclassical pairs of atoms.
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