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arXiv 1609.09009cond-mat.stat-mechquant-ph
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开放量子系统的时间相关Blip动力学

Time-Correlated Blip Dynamics of Open Quantum Systems

Michael Wiedmann, Jürgen T. Stockburger, Joachim Ankerhold

摘要:

开放量子系统的非马尔可夫动力学仍然是一个具有挑战性的任务,特别是在低温下的非微扰区。虽然随机Liouville-von Neumann方程(SLN)提供了一个形式上精确的工具来解决这个问题的离散和连续的自由度,其性能恶化了很长一段时间,由于固有的非酉传播。在这里,我们提出了一个计划,结合SLN与投影算子技术的基础上有限的移相时间,在内存存储和统计方面获得了很大的改善。该方法允许系统的收敛性,并适用于参数空间的摄动方法失败的区域,长时间域。研究结果适用于相干和非相干量子动力学的两个和三个级别的系统。在长时间域中的顺序和超交换传输率提取和微扰预测相比。

英文摘要:

The non-Markovian dynamics of open quantum systems is still a challenging task, particularly in the non-perturbative regime at low temperatures. While the Stochastic Liouville-von Neumann equation (SLN) provides a formally exact tool to tackle this problem for both discrete and continuous degrees of freedom, its performance deteriorates for long times due to an inherently non-unitary propagator. Here we present a scheme which combines the SLN with projector operator techniques based on finite dephasing times, gaining substantial improvements in terms of memory storage and statistics. The approach allows for systematic convergence and is applicable in regions of parameter space where perturbative methods fail, up to the long time domain. Findings are applied to the coherent and incoherent quantum dynamics of two- and three-level systems. In the long time domain sequential and super-exchange transfer rates are extracted and compared to perturbative predictions.

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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