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

Shunfa Liu,Yuming Wei,Jin Liu,Xuehua Wang,Ying Yu,Xueshi Li,Siyuan Yu

doi:10.1038/s41377-021-00604-8

Shunfa Liu, Yuming Wei + Show 5 more

Open Access

https://doi.org/10.1038/s41377-021-00604-8

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Abstract

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.

Highlights

The last decade has witnessed significant advances in nanophotonics by harnessing the enhanced light-matter interaction in optical microcavities[1]
We present versatile accessing of the dual-resonance conditions in deterministically coupled QD-micropillars operating in the cavity quantum electrodynamics (QED) regime
The created carriers in the GaAs material relax to the lowest excited states of the QD via electron-phonon scattering before the radiative recombination process of single-photon emissions

Summary

Introduction

The last decade has witnessed significant advances in nanophotonics by harnessing the enhanced light-matter interaction in optical microcavities[1]. E.g., cavity-enhanced scattering and excitation enable the realization of biosensing with sensitivity down to the single-molecule level[2,3,4] and highly efficient optical harmonic generations[5,6]. We present versatile accessing of the dual-resonance conditions in deterministically coupled QD-micropillars operating in the cavity QED regime. By carefully engineering the fundamental mode and the high-order mode of the micropillars, we have realized both up-converted and down-converted single-photon emission under the dual-resonance condition. We further show that the excitation efficiency under dual-resonance conditions can be greatly improved by utilizing the vectorial excitation beams with the same polarization states as the high-order cavity modes[23,24]

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