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arXiv 1806.07540quant-ph
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无时间卷积广义主方程的精确generator及其高阶展开式:在自旋玻色子模型和激发能转移中的应用

Exact generator and its high order expansions in the time-convolutionless generalized master equation: Applications to the spin-boson model and exictation energy transfer

Yanying Liu, Yaming Yan, Meng Xu, Kai Song, Qiang Shi

摘要:

无时间卷积(TCL)量子主方程提供了一个强有力的工具来模拟量子系统耦合到一个浴缸的约化动力学。TCL主方程中的关键量是所谓的核或生成元,它描述了浴自由度的影响。由于精确的TCL生成元通常很难解析计算,TCL广义主方程的大多数应用都依赖于使用二阶和四阶微扰展开的近似生成元。利用分层运动方程(HEOM)和扩展的HEOM方法,提出了一种计算精确TCL生成元及其高阶微扰展开式的新方法。将新方法应用于不同参数的自旋玻色子模型,研究了TCL生成元高阶展开式的收敛性。我们还讨论了确切的TCL发电机成为奇异的自旋玻色子模型的情况下,和一个模型的激发能转移的Fenna-Matthews-Olson复杂。

英文摘要:

The time-convolutionless (TCL) quantum master equation provides a powerful tool to simulate reduced dynamics of a quantum system coupled to a bath. The key quantity in the TCL master equation is the so-called kernel or generator, which describes effects of the bath degrees of freedom. Since the exact TCL generators are usually hard to calculate analytically, most applications of the TCL generalized master equation have relied on approximate generators using second and fourth order perturbative expansions. By using the hierarchical equation of motion (HEOM) and extended HEOM methods, we present a new approach to calculate the exact TCL generator and its high order perturbative expansions. The new approach is applied to the spin-boson model with different sets of parameters, to investigate the convergence of the high order expansions of the TCL generator. We also discuss circumstances where the exact TCL generator becomes singular for the spin-boson model, and a model of excitation energy transfer in the Fenna-Matthews-Olson complex.

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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