School of Science, Zhejiang University of Science and Technology, Hangzhou, Zhejiang, 310023, China.
College of Computer Science, Shaanxi Normal University, Xi'an 710062, China.
Sci Rep. 2017 Feb 24;7:43159. doi: 10.1038/srep43159.
Versatile controllability of interactions and magnetic field in ultracold atomic gases ha now reached an era where spin mixing dynamics and spin-nematic squeezing can be studied. Recent experiments have realized spin-nematic squeezed vacuum and dynamic stabilization following a quench through a quantum phase transition. Here we propose a scheme for storage of maximal spin-nematic squeezing, with its squeezing angle maintained in a fixed direction, in a dipolar spin-1 condensate by applying a microwave pulse at a time that maximal squeezing occurs. The dynamic stabilization of the system is achieved by manipulating the external periodic microwave pulses. The stability diagram for the range of pulse periods and phase shifts that stabilize the dynamics is numerical simulated and agrees with a stability analysis. Moreover, the stability range coincides well with the spin-nematic vacuum squeezed region which indicates that the spin-nematic squeezed vacuum will never disappear as long as the spin dynamics are stabilized.
超冷原子气体中的相互作用和磁场的多功能可控性现在已经进入了一个可以研究自旋混合动力学和自旋向列压缩的时代。最近的实验已经通过量子相变实现了自旋向列压缩真空和动态稳定。在这里，我们提出了一种在偶极自旋-1 凝聚体中存储最大自旋向列压缩的方案，通过在最大压缩时施加微波脉冲，可以将压缩角保持在固定方向。通过操纵外部周期性微波脉冲来实现系统的动态稳定。数值模拟了稳定动力学的脉冲周期和相移范围的稳定性图，并与稳定性分析相符。此外，稳定范围与自旋向列真空压缩区域很好地吻合，这表明只要自旋动力学稳定，自旋向列压缩真空就永远不会消失。
