Dual-resonance enhanced quantum light-matter interactions in deterministically coupled quantum-dot-micropillars

• Published in: Light, science & applications Vol. 10; no. 1; pp. 158 - 7
• Main Authors: Liu, Shunfa, Wei, Yuming, Li, Xueshi, Yu, Ying, Liu, Jin, Yu, Siyuan, Wang, Xuehua
• Format: Journal Article
• Language: English
• Published: England Springer Nature B.V 29.07.2021; Nature Publishing Group UK; Nature Publishing Group
• Subjects: Efficiency; Lasers; Light; Molecular beam epitaxy; Radiation
• ISSN: 2047-7538; 2095-5545; 2047-7538
• DOI: 10.1038/s41377-021-00604-8

Optical microcavities have widely been employed to enhance either the optical excitation or the photon emission processes for boosting light-matter interactions at the nanoscale. When both the excitation and emission processes are simultaneously facilitated by the optical resonances provided by the microcavities, as referred to the dual-resonance condition in this article, the performances of many nanophotonic devices approach to the optima. In this work, we present versatile accessing of dual-resonance conditions in deterministically coupled quantum-dot (QD)-micropillars, which enables emission from neutral exciton (X)-charged exciton (CX) transition with improved single-photon purity. In addition, the rarely observed up-converted single-photon emission process is achieved under dual-resonance conditions. We further exploit the vectorial nature of the high-order cavity modes to significantly improve the excitation efficiency under the dual-resonance condition. The dual-resonance enhanced light-matter interactions in the quantum regime provide a viable path for developing integrated quantum photonic devices based on cavity quantum electrodynamics (QED) effect, e.g., highly efficient quantum light sources and quantum logical gates.