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arXiv 1611.03377quant-ph
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具有误差界的开放系统:谱密度变化的自旋玻色子模型

Open systems with error bounds: spin boson model with spectral density variations

Fabio Mascherpa, Andrea Smirne, Susana F. Huelga, Martin B. Plenio

摘要:

在开放量子系统的研究中,描述环境对约化动力学影响的一种最常用的方法是通过谱密度。然而,在许多模型中,这个对象不能从第一原理计算,需要在现象学的基础上推断或拟合实验数据。因此,关于它的形式和参数的一些不确定性是不可避免的;这反过来又使人们对基于给定谱密度的任何理论预测的准确性产生疑问。在这里,我们集中在自旋玻色子模型作为一个典型的开放量子系统,并找到两个误差界的预测期望值的考虑的谱密度变化,并状态的一个充分条件,适用于最强的。我们进一步证明了我们的结果的应用,通过绑定所带来的误差所涉及的自旋玻色子动力学的运动分辨率方法的分层方程的近似。

英文摘要:

In the study of open quantum systems, one of the most common ways to describe environmental effects on the reduced dynamics is through the spectral density. However, in many models this object cannot be computed from first principles and needs to be inferred on phenomenological grounds or fitted to experimental data. Consequently, some uncertainty regarding its form and parameters is unavoidable; this in turn calls into question the accuracy of any theoretical predictions based on a given spectral density. Here, we focus on the spin-boson model as a prototypical open quantum system, and find two error bounds on predicted expectation values in terms of the spectral density variation considered, and state a sufficient condition for the strongest one to apply. We further demonstrate an application of our result, by bounding the error brought about by the approximations involved in the Hierarchical Equations of Motion resolution method for spin-boson dynamics.

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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