Quantum emitters in solids are being developed for a range of quantum technologies, including quantum networks, computing, and sensing. However, a remaining challenge is the poor photon collection due to the high refractive index of most host materials. Here we overcome this limitation by introducing monolithic parabolic reflectors as an efficient geometry for broadband photon extraction from quantum emitter and experimentally demonstrate this device for the nitrogen-vacancy (NV) center in diamond. Simulations indicate a photon collection efficiency exceeding 75% across the visible spectrum and experimental devices, fabricated using a high-throughput gray scale lithography process, demonstrating a photon extraction efficiency of (41 ± 5)%. This device enables a raw experimental detection efficiency of (12 ± 1)% with fluorescence detection rates as high as (4.114 ± 0.003) × 10⁶ counts per second (cps) from a single NV center. Enabled by our deterministic emitter localization and fabrication process, we find a high number of exceptional devices with an average count rate of (3.1 ± 0.9) × 10⁶ cps.

中文翻译：

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从金刚石抛物面反射镜中的氮空位中心有效提取光

固体量子发射器正在开发用于多种量子技术，包括量子网络，计算和传感。然而，仍然存在的挑战是由于大多数主体材料的高折射率而导致的光子收集不良。在这里，我们通过引入单片抛物面反射器作为从量子发射器中提取宽带光子的有效几何结构，克服了这一限制，并通过实验证明了该设备可用于金刚石中的氮空位（NV）中心。仿真表明，在可见光谱和实验设备上，采用高通量灰度光刻工艺制造的光子收集效率超过75％，表明光子提取效率为（41±5）％。单个NV中心每秒^6个计数（cps）。通过确定性的发射极定位和制造工艺，我们发现了大量异常器件，其平均计数率为（3.1±0.9）×10 ⁶ cps。