论文标题
V型系统非线性光子回波的非扰动方法
Nonperturbative approach to the nonlinear photon echo of V-type system
论文作者
论文摘要
非线性光谱的分析广泛用于研究凝结相物物质的动力学和结构，通常采用一种扰动方法，注意到激光与感兴趣问题之间的弱相互作用。但是，一旦激光与物质之间的相互作用很强，这种扰动方法将不再适用。我们将量子动力学演变的方法调整为信号的计算，并在非扰动方法中呈现非线性光谱的响应形式。在这种新方法中，我们证明，除了扰动方法中的三阶项外，高阶项还对两脉冲和三脉冲光子echo的非线性信号（2ppe and 3ppe）具有重要贡献。详细的计算以三级V型系统的示例进行了证明，该系统广泛用于量子光学的研究中。我们通过具有每个分子的局部模式和分子之间的共享模式来考虑环境的效果。
The analysis of nonlinear spectroscopy, widely used to study the dynamics and structures of condensed-phase matter, typically employs a perturbative approach noticing the weak interaction between the laser and the matter of interest. However, such perturbative approach is no longer applicable once the interaction between the laser and the matter is strong. We adapt the method of quantum dynamical evolution into the calculation of signal and present the response formalism of the nonlinear spectroscopy in a nonperturbative approach. In this new approach, we demonstrate that in addition to the third-order term in the perturbative method, the higher-order terms have essential contributions to the nonlinear signal of the two-pulse and three-pulse photon echo (2PPE and 3PPE). The detailed calculations are demonstrated with the example of a three-level V-type system, which is widely used in the studies of quantum optics. We consider the effect of the environment via a pure dephasing mechanism with both the localized modes of each molecule and the shared modes between molecules.
