论文标题
纳米原子座中的单锗空位中心具有散装光谱稳定性
Single germanium vacancy centres in nanodiamonds with bulk-like spectral stability
论文作者
论文摘要
由IV组颜色中心（NDS）的成功促进，需要单个光子源的混合技术，我们在室温下研究了单个葡萄晶（GEV $^ - $）中心的单个葡萄晶（GEV $^ - $）中心，在室温下，从10到50 nm的范围内，具有明显的光谱。我们表征了他们的零孔线（ZPL），研究其内部人口动态，并在三级模型的框架中比较其发射特性，该模型具有依赖强度的脱壳。此外，我们表征了它们的寿命，极化和亮度。我们发现在饱和时差距为1.6 MHz的光子发射率。我们还报告了荧光灯的极化可见性为92％，这可能使GEV $^ - $中心良好的候选量子键分布（QKD），需要偏振单光子。我们表明，这项工作中呈现的NDS的GEV $^ - $与它们的批量稳定性相比具有可比的频谱稳定性，而其批量稳定性是使用NDS的将来应用所需的。
Motivated by the success of group IV colour centres in nanodiamonds (NDs) for hybrid technology requiring a single photon source, we study single germanium-vacancy (GeV$^-$) centres in NDs at room temperature with size rangingfrom 10 to 50 nm and with remarkable spectral properties. We characterize their zero-phonon line (ZPL), study their internal population dynamics and compare their emission properties in the framework of a three level model with intensity dependent de-shelving. Furthermore, we characterize their lifetime, polarization and brightness. We find amaximum photon emission count rate of 1.6 MHz at saturation. We also report a polarization visibility of 92% from the fluorescence light, which potentially makes GeV$^-$ centres good candidates for quantum key distribution (QKD)requiring polarized single photons. We show that the GeV$^-$ in NDs presented in this work have a comparable spectral stability compared to their bulk counterpart which is needed for future applications using NDs.
