Drawer Jens-Christian, Mitryakhin Victor Nikolaevich, Shan Hangyong, Stephan Sven, Gittinger Moritz, Lackner Lukas, Han Bo, Leibeling Gilbert, Eilenberger Falk, Banerjee Rounak, Tongay Sefaattin, Watanabe Kenji, Taniguchi Takashi, Lienau Christoph, Silies Martin, Anton-Solanas Carlos, Esmann Martin, Schneider Christian
Institute of Physics, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany.
University of Applied Sciences Emden/Leer, 26723 Emden, Germany.
Nano Lett. 2023 Sep 27;23(18):8683-8689. doi: 10.1021/acs.nanolett.3c02584. Epub 2023 Sep 9.
Solid-state single-photon sources are central building blocks in quantum information processing. Atomically thin crystals have emerged as sources of nonclassical light; however, they perform below the state-of-the-art devices based on volume crystals. Here, we implement a bright single-photon source based on an atomically thin sheet of WSe coupled to a tunable optical cavity in a liquid-helium-free cryostat without the further need for active stabilization. Its performance is characterized by high single-photon purity (g(0) = 4.7 ± 0.7%) and record-high, first-lens brightness of linearly polarized photons of 65 ± 4%, representing a decisive step toward real-world quantum applications. The high performance of our devices allows us to observe two-photon interference in a Hong-Ou-Mandel experiment with 2% visibility limited by the emitter coherence time and setup resolution. Our results thus demonstrate that the combination of the unique properties of two-dimensional materials and versatile open cavities emerges as an inspiring avenue for novel quantum optoelectronic devices.
固态单光子源是量子信息处理的核心构建模块。原子级薄的晶体已成为非经典光的来源；然而，它们的性能低于基于体晶体的最先进器件。在此，我们基于耦合到可调谐光学腔的原子级薄WSe2片在无液氦低温恒温器中实现了一个明亮的单光子源，无需进一步的主动稳定化。其性能通过高单光子纯度（g(0) = 4.7 ± 0.7%）和创纪录的65 ± 4%的线性偏振光子的第一透镜亮度来表征，这代表着朝着实际量子应用迈出了决定性的一步。我们器件的高性能使我们能够在Hong-Ou-Mandel实验中观察到双光子干涉，其可见度为2%，受发射体相干时间和装置分辨率限制。因此，我们的结果表明，二维材料的独特性质与通用开放腔的结合成为新型量子光电器件的一条鼓舞人心的途径。
