Engineering the Impact of Phonon Dephasing on the Coherence of a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>WSe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> Single-Photon Source via Cavity Quantum Electrodynamics
Victor N. Mitryakhin, Alexander Steinhoff, Jens-Christian Drawer, Hangyong Shan, Matthias Florian, Lukas Lackner, Bo Han, Falk Eilenberger, Seth Ariel Tongay, Kenji Watanabe, Takashi Taniguchi, C. Antón, Ana Predojević, Christopher Gies, Martin Esmann, Christian Schneider
Abstract
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.