论文标题
固态量子发射极单光子源的多目标逆设计
Multi-objective Inverse Design of Solid-state Quantum Emitter Single-photon Sources
论文作者
论文摘要
单个固态量子发射器为实施难以区分的单光子来源提供了巨大的潜力，这对于许多光子量子信息系统至关重要。具有多个性能指标的纳米光学几何形状优化必须将裸量子发射极转换为单光子源，该量子源接近量子光子学的必要纯度，无法区分的性和亮度。我们提出了一种逆设计方法，该方法同时针对两个重要的量子量子量源：Purcell辐射速率的提高和耦合效率到所需的光收集通道中。我们明确地解决了与几何相关的功率发射，这是对量子发射极单光子源优化的关键但经常被忽视的方面。我们通过设计基于GAAS纳米光子结构中的量子发射极的设计来说明方法的功效，该量子源是量子纳米光子结构中提供的purcell因子$ f_p = 21 $，并具有94％波导耦合效率，同时尊重几何形状约束，以最大程度地减少彼此的发射器的发射器，从而使彼此的发射器脱离。我们的结果表明，比基于预先建立的波导或空腔几何形状的传统方法，多目标逆设计可以通过更有利的权衡取舍产生竞争性能。
Single solid-state quantum emitters offer considerable potential for the implementation of sources of indistinguishable single-photons, which are central to many photonic quantum information systems. Nanophotonic geometry optimization with multiple performance metrics is imperative to convert a bare quantum emitter into a single-photon source that approaches the necessary levels of purity, indistinguishability, and brightness for quantum photonics. We present an inverse design methodology that simultaneously targets two important figures-of-merit for high-performance quantum light sources: the Purcell radiative rate enhancement and the coupling efficiency into a desired light collection channel. We explicitly address geometry-dependent power emission, a critical but often overlooked aspect of gradient-based optimization of quantum emitter single-photon sources. We illustrate the efficacy of our method through the design of a single-photon source based on a quantum emitter in a GaAs nanophotonic structure that provides a Purcell factor $F_p=21$ with a 94% waveguide coupling efficiency, while respecting a geometric constraint to minimize emitter decoherence by etched sidewalls. Our results indicate that multi-objective inverse design can yield competitive performance with more favorable trade-offs than conventional approaches based on pre-established waveguide or cavity geometries.
