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arXiv quant-ph/9903022quant-ph
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阻尼谐振子两个量子模型的精确对角化

Exact Diagonalization of Two Quantum Models for the Damped Harmonic Oscillator

M. Rosenau da Costa, A. O. Caldeira, S. M. Dutra, H. Westfahl

摘要:

阻尼谐振子是量子力学中研究耗散的重要工具。然而,尽管它的简单性,这个系统已经引起了一些近似的有效性和关系,更精细的描述值得一个彻底的调查。在这项工作中,我们采用的方法,使我们能够对角化正是经常采用的耗散哈密顿在文献中。使用这种方法,我们推导出的有效性条件的行波近似(RWA),并显示这种近似的描述涉及到更一般的。我们还证明了耗散相干态的存在与RWA密切相关。最后,通过阻尼振荡器的动力学评价,我们注意到耗散模型的一个重要性质,在以前的作品中没有得到适当的考虑,即,新的约束的必要性,可因子化的初始条件的应用。

英文摘要:

The damped harmonic oscillator is a workhorse for the study of dissipation in quantum mechanics. However, despite its simplicity, this system has given rise to some approximations whose validity and relation to more refined descriptions deserve a thorough investigation. In this work, we apply a method that allows us to diagonalize exactly the dissipative Hamiltonians that are frequently adopted in the literature. Using this method we derive the conditions of validity of the rotating-wave approximation (RWA) and show how this approximate description relates to more general ones. We also show that the existence of dissipative coherent states is intimately related to the RWA. Finally, through the evaluation of the dynamics of the damped oscillator, we notice an important property of the dissipative model that has not been properly accounted for in previous works; namely, the necessity of new constraints to the application of the factorizable initial conditions.

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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