论文标题
在玻色子浴中的两级系统和具有有限相关时间的高斯波动环境中的两级系统的非马克维亚动力学
Non-Markovian dynamics of a two-level system in a bosonic bath and a Gaussian fluctuating environment with finite correlation time
论文作者
论文摘要
开放量子系统的演变特征通常在环境的相关函数中编码，或者等效地在相互作用的光谱密度函数中进行编码。当环境异质时，例如由几个具有不同光谱函数的独立亚环境组成，其中一种亚环境可以被视为辅助，并用于控制环境其余部分中开放量子系统的变色。例如，可以通过通过其光谱密度的合适参数来调整与亚环境的相互作用的特征来实现控制。我们研究了在三个独立的脱碳通道影响下的两级系统（Qubit）的非马克维亚进化，其中两个具有经典性质，并源于与随机场的相互作用，第三个是通过与骨气浴的相互作用形成的量子通道。通过修改通道的光谱密度，我们研究了它们对两级系统的稳态，其密度矩阵的演变和平衡发射光谱的影响。此外，我们研究了应用于浴通道的旋转波近似对结果准确性的影响。
The character of evolution of an open quantum system is often encoded in the correlation function of the environment or, equivalently, in the spectral density function of the interaction. When the environment is heterogeneous, e.g. consists of several independent subenvironments with different spectral functions, one of the subenvironments can be considered auxiliary and used to control decoherence of the open quantum system in the remaining part of the environment. The control can be realized, for example, by adjusting the character of interaction with the subenvironment via suitable parameters of its spectral density. We investigate non-Markovian evolution of a two-level system (qubit) under influence of three independent decoherence channels, two of them have classical nature and originate from interaction with a stochastic field, and the third is a quantum channel formed by interaction with a bosonic bath. By modifying spectral densities of the channels, we study their impact on steady states of the two-level system, evolution of its density matrix and the equilibrium emission spectrums. Additionally, we investigate the impact of the rotation-wave approximation applied to the bath channel on accuracy of the results.
