论文标题
摇摆激发技术的相干动力学
Coherent Dynamics of the Swing-Up Excitation Technique
论文作者
论文摘要
开发用于量子发射器的相干激发方法,使发射光子的高亮度,良好的单光子纯度和高难以区分的性能在过去几年中一直是一个关键挑战。尽管已经提出和探索了许多方法,但它们都有特定的优势和缺点。在这封信中,我们研究了最近的摇摆方案的动态,作为两级系统的激发方法及其在单光子生成中的性能。通过施加两个遥不可及的激光脉冲,可以在激发态下以接近统一的忠诚制备两级系统。我们使用半导体量子点证明了该技术的成功功能和连贯性。此外,我们探讨了两个激光脉冲的多维参数空间,以研究对激发保真度的影响。最后,我们研究了该方案作为产生高质量单光子的激发方法的性能。我们发现,摇摆方案本身效果很好,并且表现出几乎完美的单光子纯度,而在我们的样品中观察到的不可区分性受到不可避免的高激发能力对量子点半导体环境的影响的限制。
Developing coherent excitation methods for quantum emitters which enable high brightness, good single-photon purity and high indistinguishability of the emitted photons has been a key challenge in the past years. While many methods have been proposed and explored, they all have specific advantages and disadvantages. In this letter, we investigate the dynamics of the recent swing-up scheme as an excitation method for a two-level system and its performance in single-photon generation. By applying two far red-detuned laser pulses, the two-level system can be prepared in the excited state with near-unity fidelity. We demonstrate the successful functionality and the coherent character of this technique using semiconductor quantum dots. Moreover, we explore the multi-dimensional parameter space of the two laser pulses to study the impact on the excitation fidelity. Finally, we investigate the performance of the scheme as an excitation method for generation of high-quality single photons. We find that the swing-up scheme itself works well and exhibits nearly perfect single-photon purity, while the observed indistinguishability in our sample is limited by the influence of the inevitable high excitation powers on the semiconductor environment of the quantum dot.