光学学报, 2018, 38 (9): 0902001, 网络出版: 2019-05-09
原子芯片上指数型布居增长的原子输运 下载: 1010次
Atom Transport with Exponentially Growing Population on an Atom Chip
超冷原子 原子芯片 宇称-时间对称性 双阱 直接模拟蒙特卡罗方法 ultracold atoms atom chip parity-time symmetry double-well trap direct simulation Monte Carlo method
摘要
超冷原子体系中要观测增益平衡的宇称-时间(PT)对称,需产生受控的原子布居增益/损耗及相干耦合。本文提出了动态控制原子芯片上双阱中原子输运实现原子布居指数增长的方法。采用直接蒙特卡罗方法数值研究了原子系综在双阱间的输运动力学,发现初始原子数和温度会显著影响输运效果,如目标势阱中的原子布居增益速率和转移效率。此外,还细致分析了左侧势阱抬升时间对右侧势阱中原子布居增长趋势的影响效果。该方案为在超冷原子气体中实现有增益/损耗的PT对称量子体系提供了切实可行的方法。
Abstract
In the ultracold atomic system, to observe the Parity-Time (PT) symmetry with the gain balance requires controlled gain/loss of atom population and coherent coupling. We present a proposal to obtain an exponential growth of the atom population by dynamically controlling atom transport in a double-well trap on an atom chip. We numerically investigate the transport dynamics of the atomic ensemble between the sub-wells by using the direct simulation Monte Carlo method. It is found that the initial number and temperature of the atom cloud remarkably affect the transport performance, such as gain rate and transfer efficiency of the atom population in the target trap. Moreover, the effect of the lifting time of the left-well on the growing trend of the atom population in the right-well is analyzed in detail. Our strategy provides an achievable way for realizing a PT symmetric quantum system with gain/loss in ultracold atomic gas.
赵子豪, 王晓晨, 李博, 李萌, 蒋小军, 钱军, 李晓林. 原子芯片上指数型布居增长的原子输运[J]. 光学学报, 2018, 38(9): 0902001. Zihao Zhao, Xiaochen Wang, Bo Li, Meng Li, Xiaojun Jiang, Jun Qian, Xiaolin Li. Atom Transport with Exponentially Growing Population on an Atom Chip[J]. Acta Optica Sinica, 2018, 38(9): 0902001.