标题： 通过管理其无功功率控制量子发射器的带宽 显示英文标题

标题： Control of a quantum emitter's bandwidth by managing its reactive power

摘要： 无功功率在小型天线系统的设计中起着关键作用，但其对量子发射器带宽的影响通常被忽略。 在这里，我们理论证明，在通常的弱耦合和强耦合 regimes 之间存在一个中间领域，其中量子发射器的带宽直接与无功功率的色散特性相关。 这一结果强调了必须将无功功率视为工程量子发射器带宽的额外自由度。 我们通过重新审视量子发射器与共振腔和波导的典型配置来说明这一概念的适用性。 对这些系统中的无功功率的分析揭示了新的功能，包括设计高效但窄带的光子源，以及表现出比其非辐射线宽更窄带宽的量子发射器。 显示英文摘要

摘要： Reactive power plays a crucial role in the design of small antenna systems, but its impact on the bandwidth of quantum emitters is typically disregarded. Here, we theoretically demonstrate that there is an intermediate domain between the usual weak and strong coupling regimes where the bandwidth of a quantum emitter is directly related to the dispersion properties of the reactive power. This result emphasizes that reactive power must be understood as an additional degree of freedom in engineering the bandwidth of quantum emitters. We illustrate the applicability of this concept by revisiting typical configurations of quantum emitters coupled to resonant cavities and waveguides. Analysis of the reactive power in these system unveils new functionalities, including the design of effcient but narrowband photon sources, as well as quantum emitters exhibiting a bandwidth narrower than its nonradiative linewidth.