Engineering the Impact of Phonon Dephasing on the Coherence of a WSe 2 Single-Photon Source via Cavity Quantum Electrodynamics

• Published in: Physical review letters 2024-05, Vol.132 (20), Article 206903
• Main Authors: Mitryakhin, Victor N., Steinhoff, Alexander, Drawer, Jens-Christian, Shan, Hangyong, Florian, Matthias, Lackner, Lukas, Han, Bo, Eilenberger, Falk, Tongay, Seth Ariel, Watanabe, Kenji, Taniguchi, Takashi, Antón-Solanas, Carlos, Predojević, Ana, Gies, Christopher, Esmann, Martin, Schneider, Christian
• Format: Article
• Language: English
• ISSN: 0031-9007; 1079-7114; 1079-7114
• DOI: 10.1103/PhysRevLett.132.206903

Emitter dephasing is one of the key issues in the performance of solid-state single-photon sources. Among the various sources of dephasing, acoustic phonons play a central role in adding decoherence to the single-photon emission. Here, we demonstrate that it is possible to tune and engineer the coherence of photons emitted from a single WSe 2  monolayer quantum dot via selectively coupling it to a spectral cavity resonance. We utilize an open cavity to demonstrate spectral enhancement, leveling, and suppression of the highly asymmetric phonon sideband, finding excellent agreement with a microscopic description of the exciton-phonon dephasing in a truly two-dimensional system. Moreover, the impact of cavity tuning on the dephasing is directly assessed via optical interferometry, which points out the capability to utilize light-matter coupling to steer and design dephasing and coherence of quantum emitters in atomically thin crystals.