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arXiv quant-ph/0604158quant-ph
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三势阱中玻色-爱因斯坦凝聚体的半经典方法

Semiclassical approach to Bose-Einstein condensates in a triple well potential

S. Mossmann, C. Jung

摘要:

本文提出了一种在少模近似下分析玻色-爱因斯坦凝聚体的新方法。该方法已成功地用于分析各种分子系统的振动模式,并为研究许多粒子玻色子系统的动力学提供了一个新的视角。讨论了三重势阱中的玻色-爱因斯坦凝聚体组成的系统。这样的系统对应于具有三个自由度的经典哈密顿系统。半经典的方法允许一个简单的可视化的量子系统的本征态参考潜在的经典动力学。从这种分类中,我们可以读出本征态的动力学性质,如阱间的粒子交换和纠缠,而无需进一步的计算。此外,这种方法提供了新的见解的有效性的平均场描述的多粒子系统的Gross-Pitaevskii方程,因为我们正是利用这种对应在我们的半经典分析。我们选择了一个三模式系统,以便于可视化,而且,有一个足够有趣的结构,虽然该方法也可以扩展到更高维的系统。

英文摘要:

We present a new approach for the analysis of Bose-Einstein condensates in a few mode approximation. This method has already been used to successfully analyze the vibrational modes in various molecular systems and offers a new perspective on the dynamics in many particle bosonic systems. We discuss a system consisting of a Bose-Einstein condensate in a triple well potential. Such systems correspond to classical Hamiltonian systems with three degrees of freedom. The semiclassical approach allows a simple visualization of the eigenstates of the quantum system referring to the underlying classical dynamics. From this classification we can read off the dynamical properties of the eigenstates such as particle exchange between the wells and entanglement without further calculations. In addition, this approach offers new insights into the validity of the mean-field description of the many particle system by the Gross-Pitaevskii equation, since we make use of exactly this correspondence in our semiclassical analysis. We choose a three mode system in order to visualize it easily and, moreover, to have a sufficiently interesting structure, although the method can also be extended to higher dimensional systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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