Fiedler Saskia, Morozov Sergii, Komisar Danylo, Ekimov Evgeny A, Kulikova Liudmila F, Davydov Valery A, Agafonov Viatcheslav N, Kumar Shailesh, Wolff Christian, Bozhevolnyi Sergey I, Mortensen N Asger
Nanophotonics. 2023 May 29;12(12):2231-2237. doi: 10.1515/nanoph-2023-0204. eCollection 2023 Jun.
Impurity-vacancy centers in diamond offer a new class of robust photon sources with versatile quantum properties. While individual color centers commonly act as single-photon sources, their ensembles have been theoretically predicted to have tunable photon-emission statistics. Importantly, the particular type of excitation affects the emission properties of a color center ensemble within a diamond crystal. While optical excitation favors non-synchronized excitation of color centers within an ensemble, electron-beam excitation can synchronize the emitters excitation and thereby provides a control of the second-order correlation function (0). In this letter, we demonstrate experimentally that the photon stream from an ensemble of color centers can exhibit (0) both above and below unity, thereby confirming long standing theoretical predictions by Meuret et al. [S. Meuret, L. H. G. Tizei, T. Cazimajou, et al., "Photon bunching in cathodoluminescence," , vol. 114, no. 19, p. 197401, 2015.]. Such a photon source based on an ensemble of few color centers in a diamond crystal provides a highly tunable platform for informational technologies operating at room temperature.
金刚石中的杂质 - 空位中心提供了一类新型的具有多种量子特性的稳健光子源。虽然单个色心通常充当单光子源，但从理论上预测它们的集合具有可调谐的光子发射统计特性。重要的是，特定类型的激发会影响金刚石晶体内色心集合的发射特性。光学激发有利于集合内色心的非同步激发，而电子束激发可以使发射体的激发同步，从而控制二阶关联函数 (g^{(2)}(0))。在本信函中，我们通过实验证明，来自色心集合的光子流在 (g^{(2)}(0)) 上既可以表现出大于1也可以表现出小于1，从而证实了Meuret等人的长期理论预测[ S. Meuret, L. H. G. Tizei, T. Cazimajou, 等人，“阴极发光中的光子聚束”，《物理评论快报》，第114卷，第19期，第197401页，2015年。]。这种基于金刚石晶体中少数色心集合的光子源为在室温下运行的信息技术提供了一个高度可调谐的平台。
