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arXiv · 2109.09284

Tailoring solid-state single-photon sources with stimulated emissions

Yuming Wei·Shunfa Liu·Xueshi Li·Ying Yu·Xiangbin Su·Shulun Li·Shangjun Xiang·Hanqing Liu·Huiming Hao·Haiqiao Ni·Siyuan Yu·Zhichuan Niu·Jake Iles-Smith·Jin Liu·Xuehua Wang
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Abstract

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 (QD) through stimulated emission. After populating the biexciton (XX) of the QD through two-photon resonant excitation (TPE), 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 yields improved polarized single-photon source characteristics 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 QD single-photon sources and expands the capabilities of three-level systems for advanced quantum photonic functionalities.

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Yuming Wei, Shunfa Liu, Xueshi Li, Ying Yu, Xiangbin Su, Shulun Li, Shangjun Xiang, Hanqing Liu, Huiming Hao, Haiqiao Ni, Siyuan Yu, Zhichuan Niu, Jake Iles-Smith, Jin Liu, Xuehua Wang. 2021-09-20. Tailoring solid-state single-photon sources with stimulated emissions. https://doi.org/10.1038/s41565-022-01092-6

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