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Filter-free single-photon quantum dot resonance fluorescence in an integrated cavity-waveguide device

TitleFilter-free single-photon quantum dot resonance fluorescence in an integrated cavity-waveguide device
Publication TypeJournal Article
Year of Publication2020
AuthorsT. Huber, M. Davanco, M. Muller, Y. Shuai, O. Gazzano, and G. S. Solomon
JournalOptica
Volume7
Pagination380-385
Date PublishedMAY 20
Type of ArticleArticle
ISSN2334-2536
Abstract

Semiconductor quantum dots embedded in micropillar cavities are excellent emitters of single photons when pumped resonantly. Often, the same spatial mode is used to both resonantly excite a quantum-dot state and to collect the emitted single photons, requiring cross polarization to reduce the uncoupled scattered laser light. This inherently reduces the source brightness to 50%. Critically, for some quantum applications the total efficiency from generation to detection must be over 50%. Here, we demonstrate a resonant-excitation approach to creating single photons that is free of any cross polarization, and in fact any filtering whatsoever. It potentially increases single-photon rates and collection efficiencies, and simplifies operation. This integrated device allows us to resonantly excite single quantum-dot states in several cavities in the plane of the device using connected waveguides, while the cavity-enhanced single-photon fluorescence is directed vertically (off-chip) in a Gaussian mode. We expect this design to be a prototype for larger chip-scale quantum photonics. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

DOI10.1364/OPTICA.382273