Few-Level Models in Atomic Radiation Theory (Physics)

建议将腔量子电动力学中的少能级模型的使用扩展到非共振和零光子原子过程。在这些情况下，通常的自由空间QED假设(即宽带真空库)可能是无效的。这里的目标是考虑可以探测到非常短的响应时间的替代交互。辐射相互作用的一个基本类别是拉曼类别。只有两个原子能级和三能级模型不能很好地模拟它们，除非可以证明与中间态有关的绝热近似是合理的。需要考虑的问题包括：(A)中间态大失谐所隐含的短时间尺度的意义，(B)绝热消除是否合理，(C)光子-原子修饰态的实用性，(D)非经典场态的影响，以及(E)关联对Stokes波和反Stokes波的影响。

It is proposed to extend the use of few-level models in cavity quantum electrodynamics to off-resonant and zero-photon atomic processes. In these situations the usual free space QED assumptions (i.e. broad band vacuum reservoir) may be invalid. The objective here is to consider alternative interactions that can probe very short response times. One such fundamental class of radiative interactions is the Raman class. These are not well modelled by only two atomic levels and three level models may be necessary unless an adiabatic approximation can be justified in connection with the intermediate state. Points to be considered include: (a) significance of the short time scale implied by the large detuning of the intermediate state, (b) whether adiabatic elimination can be justified, (c) utility of photon-atom dressed states, (d) effects of non-classical field states, and (e) effects of correlations on Stokes and anti-Stokes waves.