发表机构
Institute of Science Tokyo; National Institute of Advanced Industrial Science and Technology; National Institute for Materials Science; National Institutes for Quantum Science and Technology（东京科学大学; 产业技术综合研究所; 国立材料研究所; 量子科学技术研究开发机构）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文通过固体浸没透镜将金刚石铅空位中心发射增强约10倍，实现窄线宽与双光子干涉，推动其量子网络节点应用。
AI 中文摘要
金刚石中带负电的铅空位（PbV-）中心是一种新型量子系统，由于其较大的基态分裂，可在高于4 K的高温下运行。为了解锁PbV-中心的量子特性，荧光强度的增强是一个关键问题。在此，我们展示了通过在高干2000°C的高温退火导致的粗糙金刚石表面上制备的固体浸没透镜（SILs），将PbV-中心的发射增强了约10倍。共振激发揭示了接近变换极限线宽的窄发射。此外，我们展示了在SIL中使用单个PbV-中心的双光子干涉。这种增强的发射和不可区分性将推动PbV-中心向量子网络节点应用的进一步发展。
英文摘要
A negatively charged lead-vacancy (PbV-) center in diamond is a novel quantum system which can be operated at a high temperature above 4 K owing to its large ground state splitting. To unlock the quantum properties of the PbV- center, the enhancement of the fluorescence intensity is a key issue. Here, we demonstrate enhanced emission from PbV- centers by a factor of approximately 10 using solid immersion lenses (SILs) fabricated on rough diamond surface caused by high-temperature anneal over 2000°C. Resonant excitation reveals the narrow emission close to the transform-limited linewidth. Furthermore, we demonstrate two-photon interference using one single PbV- center in an SIL. This enhanced emission and indistinguishability will lead to further development of the PbV- center towards quantum network node applications.
