Related papers: Single-photon emitters in WSe$_2$: Critical role of phonons on excitation schemes and indistinguishability

Single-photon emitters in WSe$_2$: Critical role of phonons on excitation schemes and indistinguishability

URL: http://arxiv.org/abs/2402.10897v3
Date: Fri, 14 Jun 2024 08:44:29 GMT
Title: Single-photon emitters in WSe$_2$: Critical role of phonons on excitation schemes and indistinguishability
Authors: Luca Vannucci, José Ferreira Neto, Claudia Piccinini, Athanasios Paralikis, Niels Gregersen, Battulga Munkhbat,
Abstract summary: We reconstruct the phonon spectral density experienced by WSe$_2$ quantum emitters in the emission process. We observe near-unity excitation fidelity up to 0.976 (0.997) under near-resonant phonon-assisted excitation.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: Within optical quantum information processing, single-photon sources based on a two-level system in a semiconductor material allow for on-demand generation of single photons. To initiate the spontaneous emission process, it is necessary to efficiently populate the excited state. However, reconciling the requirement for on-demand excitation with both high efficiency and high photon indistinguishability remains a challenge due to the presence of charge noise and phonon-induced decoherence in the solid-state environment. Here, we propose a method for reconstructing the phonon spectral density experienced by WSe$_{2}$ quantum emitters in the emission process. Using the reconstructed phonon spectral density, we analyze the performance of the resonant, phonon-assisted, and Swing-UP of the quantum EmitteR population (SUPER) swing-up excitation schemes. Under resonant excitation, we obtain an exciton preparation fidelity limited to $\sim$0.80 by the strong phonon coupling, which improves to 0.96 for the SUPER scheme (or 0.89, depending on the type of emitter considered). Under near-resonant phonon-assisted excitation, we observe near-unity excitation fidelity up to 0.976 (0.997). Additionally, we demonstrate that, assuming the suppression of the phonon sidebands, residual dephasing mechanisms such as charge/spin fluctuations are the dominating decoherence mechanisms undermining the photon indistinguishability.

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