Controlling cooperative emission and superradiance in waveguide-coupled quantum dots

Experimental data supporting figures shown in the paper: Controlling cooperative emission and superradiance in waveguide-coupled quantum dotsPreprint available at: https://arxiv.org/abs/2410.17890Abstract: We report the measurement of collective emission from a pair of independently tuneable InAs quantum dots embedded in a nanophotonic waveguide. A split diode structure allows independent electrical control of the quantum dot transition energies over a wide range with minimal loss in waveguide coupling efficiency. We utilise this to systematically map out the transition from collective to independent emission. We perform both lifetime as well as Hanbury Brown-Twiss measurements on the device, observing anti-dips in the photon coincidences indicating collective emission while at the same time observing a drop in lifetime around zero detuning, indicating superradiant behaviour. Performing both measurement types allows us to investigate detuning regions which show both superradiant rate enhancement and inter-emitter coherence, as well as regions in which correlations persist in the absence of rate enhancement.

本实验数据支持论文中展示的图示：控制波导耦合量子点中的合作发射和超辐射现象
预印本可在以下链接获取：https://arxiv.org/abs/2410.17890
摘要：本文报道了对一对独立可调谐的InAs量子点在纳米光子波导中的集体发射的测量。采用分割二极管结构，可实现对量子点能级在较宽范围内的独立电控，同时保持波导耦合效率的最低损失。利用此特性，我们系统地绘制了从集体发射到独立发射的转换过程。我们对该设备进行了寿命以及Hanbury Brown-Twiss测量，观察到光子巧合中的反谷值，表明了集体发射现象，同时在零失谐附近观察到寿命的下降，表明了超辐射行为。通过进行这两种测量类型，我们得以研究同时表现出超辐射速率增强和发射器间相干性的失谐区域，以及在没有速率增强的情况下仍保持相关性的区域。