Monolayer-Based Single-Photon Source in a Liquid-Helium-Free Open Cavity Featuring 65% Brightness and Quantum Coherence

• DOI: 10.1021/acs.nanolett.3c02584
• Publication Date: 2023-09-09T14:18:51Z
• Authors: Jens-Christian Dr...; Victor Nikolaevic...; Hangyong Shan; Sven Stephan; Moritz Gittinger; Lukas Lackner; Bo Han; Gilbert Leibeling; Falk Eilenberger; Rounak Banerjee; Sefaattin Tongay; Kenji Watanabe; Takashi Taniguchi; Christoph Lienau; Martin Silies; Carlos Anton-Solanas; Martin Esmann; Christian Schneider
• Keywords: Single-Photon Source

Solid-state single-photon sources are central building blocks in quantum information processing. Atomically thin crystals have emerged as of nonclassical light; however, they perform below the state-of-the-art devices based on volume crystals. Here, we implement a bright source an atomically sheet WSe2 coupled to tunable optical cavity liquid-helium-free cryostat without further need for active stabilization. Its performance is characterized by high purity (g(2)(0) = 4.7 ± 0.7%) and record-high, first-lens brightness linearly polarized photons 65 4%, representing decisive step toward real-world applications. The our allows us observe two-photon interference Hong-Ou-Mandel experiment with 2% visibility limited emitter coherence time setup resolution. Our results thus demonstrate that combination unique properties two-dimensional materials versatile open cavities emerges inspiring avenue novel optoelectronic devices.