Journal
NATURE NANOTECHNOLOGY
Volume 17, Issue 5, Pages 470-+Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41565-022-01092-6
Keywords
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Funding
- National Key R&D Program of China [2018YFA0306101, 2021YFA1400800]
- Key-Area Research and Development Program of Guangdong Province [2018B030329001]
- Guangdong Special Support Program [2019JC05X397]
- National Natural Science Foundation of China [62035017, 11874437, 12074442, 91836303]
- Local Innovative and Research Teams Project of the Guangdong Pearl River Talents Program [2017BT01X121]
- National Super-Computer Center in Guangzhou
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Researchers have enhanced the spontaneous emission from a ladder-type three-level system in a single epitaxial quantum dot through stimulated emission, achieving bright polarized sources with high photon purity and indistinguishability. This approach can significantly improve the performance of single-photon sources and expand the capabilities of three-level systems for advanced quantum photonic functionalities.
Deterministic single-photon sources are a key building block for photonic quantum technologies. Stimulated emission now helps tailoring spontaneous emission from a ladder-type three-level system in a single epitaxial quantum dot for bright polarized sources with a high photon purity and indistinguishability. The coherent interaction of electromagnetic fields with solid-state two-level systems can yield deterministic quantum light sources for photonic quantum technologies. To date, the performance of semiconductor single-photon sources based on three-level systems is limited mainly due to a lack of high photon indistinguishability. Here we tailor the cavity-enhanced spontaneous emission from a ladder-type three-level system in a single epitaxial quantum dot through stimulated emission. After populating the biexciton (XX) of the quantum dot through two-photon resonant excitation, we use another laser pulse to selectively depopulate the XX state into an exciton (X) state with a predefined polarization. The stimulated XX-X emission modifies the X decay dynamics and improves the characteristics of a polarized single-photon source, such as a source brightness of 0.030(2), a single-photon purity of 0.998(1) and an indistinguishability of 0.926(4). Our method can be readily applied to existing quantum dot single-photon sources and expands the capabilities of three-level systems for advanced quantum photonic functionalities.
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