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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 WSe2 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.Received 20 July 2023Revised 26 February 2024Accepted 22 March 2024DOI:https://doi.org/10.1103/PhysRevLett.132.206903© 2024 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasAcoustic phononsExcitonsOpen quantum systems & decoherenceOptical & microwave phenomenaOptical coherencePhotonicsSingle photon sourcesPhysical SystemsQuantum dotsTransition metal dichalcogenidesTechniquesCavity resonatorsOptical interferometryOptical pumpingPhotoluminescenceCondensed Matter, Materials & Applied PhysicsQuantum Information, Science & Technology
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