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arXiv 0901.1453quant-ph
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量子振子向平衡态的动力学演化

Dynamical evolution of quantum oscillators towards equilibrium

A R Usha Devi, A K Rajagopal

摘要:

大量N个振子的纯量子态通过谐波耦合相互作用,演化使得全局态的任何小子系统n<<N接近平衡。这提供了一个新的例子,其中平衡作为量子动力学下的自然现象出现,没有必要引入任何额外的统计假设。平衡子系统的混合度,由1,2,.....,n<<N清楚地表明小的子系统与状态的其余部分纠缠,即,洗澡每一个单模振荡器被发现松弛的混合密度矩阵的玻尔兹曼标准型。在两个振子平衡的子系统中,发现存在“系统”振子内的纠缠时,浴的压缩参数的大小与耦合强度的大小相当。

英文摘要:

A pure quantum state of large number N of oscillators, interacting via harmonic coupling, evolves such that any small subsystem n<<N of the global state approaches equilibrium. This provides a novel example where equilibration emerges as a natural phenomena under quantum dynamics alone, with no necessity to bring in any additional statistical postulates. Mixedness of equilibrated subsystems consisting of 1, 2, ....., n<<N clearly indicates that small subsystems are entangled with the rest of the state i.e., the bath. Every single mode oscillator is found to relax in a mixed density matrix of the Boltzmann canonical form. In two oscillator equilibrated subsystems, intra-entanglement within the `system' oscillators is found to exist when the magnitude of the squeezing parameter of the bath is comparable in magnitude with that of the coupling strength.

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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