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Temporal shaping of single photons by engineering exciton dynamics in a single quantum dot

TitleTemporal shaping of single photons by engineering exciton dynamics in a single quantum dot
Publication TypeJournal Article
Year of Publication2021
AuthorsK-Y. Kim, C. J. K. Richardson, E. Waks, and J-H. Kim
JournalAPL Phontonics
Volume6
Date PublishedAUG 1
Type of ArticleArticle
ISSN2378-0967
Abstract

The majority of photonic quantum information technologies rely on single photons that have high purity and indistinguishability. Although solid-state quantum emitters can serve such single photons on demand, their asymmetric temporal and spatial mode profiles limit the optimal efficiency and fidelity of quantum interaction. Here, we demonstrate single-photon pulses at a telecom wavelength with a Gaussian-like temporal mode profile from a cavity-coupled single quantum dot. Engineering the exciton dynamics via multi-exciton cascade recombination and cavity detuning enables us to modify the rise and decay dynamics of single excitons. Furthermore, the cascade recombination process temporally retards the single-exciton emission from the background emission, leading to possible purification of single photons at high excitation power. In addition, coupling quantum dots into a low Q cavity mode leads to a Gaussian-like spatial mode profile, which brings a high collection efficiency. This approach paves the way for producing single photons with an optimized temporal and spatial waveform.

DOI10.1063/5.0045241