تقرير
Single-photon emitters in WSe$_2$: Critical role of phonons on excitation schemes and indistinguishability
| العنوان: | Single-photon emitters in WSe$_2$: Critical role of phonons on excitation schemes and indistinguishability |
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| المؤلفون: | Vannucci, Luca, Neto, José Ferreira, Piccinini, Claudia, Paralikis, Athanasios, Gregersen, Niels, Munkhbat, Battulga |
| المصدر: | Phys. Rev. B 109, 245304 (2024) |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter Physics (Other) Quantum Physics |
| مصطلحات موضوعية: | Quantum Physics, Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Optics |
| الوصف: | 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. Comment: 13 pages, 5 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.109.245304 |
| URL الوصول: | http://arxiv.org/abs/2402.10897 |
| رقم الأكسشن: | edsarx.2402.10897 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.109.245304 |
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