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arXiv 1305.2189cond-mat.stat-mechphysics.chem-phphysics.comp-ph
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小热环境中耦合量子振子系统的含时量子热力学

Time Dependent Quantum Thermodynamics of a Coupled Quantum Oscillator System in a Small Thermal Environment

George L. Barnes, Michael E. Kellman

摘要:

模拟了一个小量子系统与量子环境的相互作用。该系统由两个谐振子的各种初始状态耦合,给出正常模式。环境是由其水平模式“设计”的,具有热力学温度。随机耦合导致系统和环境在时间演化过程中纠缠。观察到的玻尔兹曼分布的方法,并得到接近设计温度的有效拟合温度。系统的所有初始纯态都以非常相似的速率被驱动到平衡态,并且初始状态的记忆会迅速丧失。计算冯诺伊曼熵的时间演化作为平衡和量子相干性的量度。有人认为,与通常的理解相反,量子干涉和相干性只有在最大熵时才能消除,这在热上对应于无限温度。我们的研究结果的概念“经典化”的行为的方法热平衡的影响被简要地考虑。

英文摘要:

Simulations are performed of a small quantum system interacting with a quantum environment. The system consists of various initial states of two harmonic oscillators coupled to give normal modes. The environment is "designed" by its level pattern to have a thermodynamic temperature. A random coupling causes the system and environment to become entangled in the course of time evolution. The approach to a Boltzmann distribution is observed, and effective fitted temperatures close to the designed temperature are obtained. All initial pure states of the system are driven to equilibrium at very similar rates, with quick loss of memory of the initial state. The time evolution of the von Neumann entropy is calculated as a measure of equilibration and of quantum coherence. It is argued, contrary to common understanding, that quantum interference and coherence are eliminated only with maximal entropy, which corresponds thermally to infinite temperature. Implications of our results for the notion of "classicalizing" behavior in the approach to thermal equilibrium are briefly considered.

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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