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arXiv 1905.04591quant-ph
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受迫量子倒相振荡器

Forced quantum inverted oscillator

P. A. Golovinski

摘要:

给出了在可变外力作用下量子倒振子的新的精确和渐近结果。为了说明我们的方法的优点,我们应用所获得的传播子的描述的演化的初始高斯波包在任意的时间相关的力或δ-脉冲作用。在准静态近似下,我们求解了在低频简谐力作用下粒子隧穿抛物势垒的替代问题。转到Caldeira-Leggett模型中的Heisenberg图像,我们描述了含时力对开放倒振子的影响。其动力学形式是由波包扩散和布朗运动引起的坐标算子平均值的演化和随机扩散的结合。

英文摘要:

New exact and asymptotic results for a quantum inverted oscillator, driven by the variable external force, are presented. To illustrate the advantages of our approach, we applied the obtained propagator to the descriptions of evolution the initial Gaussian wave packet under arbitrary time-dependent force or a δ-pulse action. The alternative problem of tunneling a particle through a parabolic barrier under the influence of a low-frequency harmonic force we solve in the quasistatic approximation. Going to the Heisenberg picture in the Caldeira-Leggett model, we describe the influence of a time-dependent force on an open inverted oscillator. The resulting dynamics is presented in the form of combination the evolution of the average value of a coordinate operator and the stochastic diffusion, being induced the wave packet spreading and the Brownian motion.

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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