旋量BEC中的量子噪声、标度和畴的形成

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摘要翻译：
本文讨论了由Stamper-Kurn组[Sadler et al.Nature(2006)]实验研究的87Rb下F=1原子的玻色-爱因斯坦旋量凝聚。用su(1,1）代数模拟量子光学中的双模压缩，描述了从纯f=1,m_F=0态的N个原子凝聚开始的样品的动力学量子涨落。在这个系统中，初始的m_F=0凝聚体作为产生m_F=+1,-1原子对的源(`泵')。我们证明了即使整个系统是由一个零熵的纯态描述的，通过追踪m_F=-1，0个自由度得到的m_F=+1个自由度的约化密度矩阵对应于一个热态。此外，系统初始动力学的这些量子涨落为铁磁取向自旋畴的形成提供了种子。
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英文标题：
《Quantum Noise, Scaling and Domain Formation in a Spinor BEC》
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作者：
George I. Mias, Nigel R. Cooper and S. M. Girvin
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最新提交年份：
2007
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分类信息：

一级分类：Physics        物理学
二级分类：Statistical Mechanics        统计力学
分类描述：Phase transitions, thermodynamics, field theory, non-equilibrium phenomena, renormalization group and scaling, integrable models, turbulence
相变，热力学，场论，非平衡现象，重整化群和标度，可积模型，湍流
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一级分类：Physics        物理学
二级分类：Quantum Physics        量子物理学
分类描述：Description coming soon
描述即将到来
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英文摘要：
  In this paper we discuss Bose-Einstein spinor condensates for F=1 atoms in the context of 87Rb, as studied experimentally by the Stamper-Kurn group [Sadler et al. Nature (2006)]. The dynamical quantum fluctuations of a sample that starts as a condensate of N atoms in a pure F=1, m_F = 0 state are described in analogy to the `two-mode squeezing' of quantum optics in terms of an su(1,1) algebra. In this system the initial m_F=0 condensate acts as a source (`pump') for the creation pairs of m_F =+1,-1 atoms. We show that even though the system as a whole is described by a pure state with zero entropy, the reduced density matrix for the m_F = +1 degree of freedom, obtained by tracing out the m_F = -1,0 degrees of freedom, corresponds to a thermal state. Furthermore, these quantum fluctuations of the initial dynamics of the system provide the seeds for the formation of domains of ferromagnetically aligned spins.
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PDF链接：
https://arxiv.org/pdf/710.3547

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关键词：BEC Fluctuations Experimental Fluctuation equilibrium 凝聚 Sadler 原子 2006 87Rb