Non-equilibrium physics and quantum technologies

半导体量子点的共振荧光是未来量子技术中最有前途的产生单光子的方法之一。从共振驱动的量子点发射的光谱表现出诸如反聚束和亚自然线宽的特性，这在单光子源中是期望的。然而，最近的研究（实验和理论）表明，这些特征不能同时观察到。这是因为发射光谱的滤波可以影响发射光的光子统计，例如削弱反聚束效应。因此，深入了解光谱滤波效应对量子点单光子源的进一步发展至关重要。本项目将开发新的理论方法来研究滤波对半导体量子发射器光学特性的影响。特别是，我们将研究电子-声子相互作用对半导体量子点发射光谱的影响，以及光谱滤波如何改变所产生的光学性质。本计画将联合收割机结合开放量子系统理论的新技术，以主方程形式主义与滤波器形式主义为基础，研究量子发射体的光学一阶和二阶相干性。

Resonance fluorescence of semiconductor quantum dots is one of the most promising ways to produce single photons for future quantum technologies. The spectrum emitted from a resonantly driven quantum dot exhibits characteristics such as antibunching and a subnatural linewidth, which are desired in a single-photon source. However, recent research (experimental and theoretical) has revealed that these characteristics cannot be observed simultaneously. This is because filtering of the emitted spectrum can affect the photon statistics of the emitted light, e.g. weakening the antibunching effect. Therefore, an in-depth understanding of the effects of spectral filtering is essential to the further progress in development of quantum dot single-photon sources. This project will develop novel theoretical methods to study the impact of filtering on the optical properties of semi-conductor quantum emitters. In particular, we will study the impact that electron-phonon interactions have on the emitted spectrum of a semiconductor quantum dot and how spectral filtering alters the resulting optical properties. This project will combine novel techniques from open quantum systems theory based on the master equation formalism with the filter formalism, to study the optical first- and second-order coherence of a quantum emitter.