We analyze the quantum dynamics of a two-level emitter in a resonant microcavity with optical feedback provided by a distant mirror (i.e., a half cavity) with a focus on stabilizing the emitter-microcavity subsystem. Our treatment is fully carried out in the framework of cavity quantum electrodynamics. Specifically, we focus on the dynamics of a perturbed subradiant state of the emitter-microcavity subsystem to ascertain its stability (existence of time oscillatory solutions around the candidate state) or lack thereof. In particular, we find conditions under which multiple feedback modes of the half cavity contribute to the stability, showing certain analogies with the Lang-Kobayashi equations, which describe a laser diode subject to classical optical feedback.

中文翻译：

---

微腔-半腔耦合系统中微腔激发的量子稳定

我们分析了共振微腔中的两级发射器的量子动力学，该反射器由远距离镜（即半腔）提供了光反馈，重点是稳定发射器-微腔子系统。我们的治疗是完全在腔量子电动力学的框架内进行的。具体来说，我们专注于发射器微腔子系统的扰动亚辐射状态的动力学，以确定其稳定性（候选状态周围存在时间振荡解）或缺乏稳定性。特别是，我们找到了半腔的多种反馈模式有助于稳定性的条件，这与Lang-Kobayashi方程显示了某些类比，该方程描述了经受经典光学反馈的激光二极管。