Nanocavity enhanced photon coherence of solid-state quantum emitters operating up to 30 K

Data from the manuscript "Nanocavity enhanced photon coherence of solid-state quantum emitters operating up to 30 K".Abstract:Solid-state emitters such as epitaxial quantum dots have emerged as a leading platform for efficient, on-demand sources of indistinguishable photons, a key resource for many optical quantum technologies. To maximise performance, these sources normally operate at liquid helium temperatures (~4 K), introducing significant size, weight and power requirements that can be impractical for proposed applications. Here we experimentally resolve the two distinct temperature-dependent phonon interactions that degrade indistinguishability, allowing us to demonstrate that coupling to a photonic nanocavity can greatly improve photon coherence at elevated temperatures compatible with compact cryocoolers. We derive a polaron model that fully captures the temperature-dependent influence of phonons observed in our experiments, providing predictive power to further increase the indistinguishability and operating temperature of future devices through optimised cavity parameters.

摘自论文《固态量子发射器在高达30 K温度下的纳米腔增强光子相干性》。摘要：固态发射器，例如外延量子点，已成为高效、按需产生不可区分光子的重要平台，这对于众多光学量子技术至关重要。为了最大化性能，这些源通常在液氦温度（约4 K）下运行，这引入了显著的尺寸、重量和功耗要求，这在许多应用中可能不切实际。在本研究中，我们实验性地解析了两种不同的温度依赖性声子相互作用，这些相互作用会降低不可区分性，从而让我们证明将光子耦合到纳米腔可以显著提高在紧凑型制冷器兼容的较高温度下的光子相干性。我们推导出一个极化子模型，该模型完全捕捉了我们实验中观察到的声子温度依赖性影响，为通过优化腔体参数进一步增加未来设备的不可区分性和工作温度提供了预测能力。