Efficient out-coupling of high-purity single photons from a coherent quantum dot in a photonic-crystal cavity

Kristian Høeg Madsen, Serkan Ates, J. Liu, Alisa Javadi, S. M. Albrecht, I. Yeo, Søren Stobbe, Peter Lodahl

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Abstract

We demonstrate a single-photon collection efficiency of (44.3 ± 2.1)% from a quantum dot in a low-Q mode of a photonic-crystal cavity with a single-photon purity of g(2)(0) = (4 ± 5)% recorded above the saturation power. The high efficiency is directly confirmed by detecting up to 962 ± 46 kilocounts per second on a single-photon detector on another quantum dot coupled to the cavity mode. The high collection efficiency is found to be broadband, as is explained by detailed numerical simulations. Cavity-enhanced efficient excitation of quantum dots is obtained through phonon-mediated excitation and under these conditions, single-photon indistinguishability measurements reveal long coherence times reaching 0.77 ± 0.19 ns in a weak-excitation regime. Our work demonstrates that photonic crystals provide a very promising platform for highly integrated generation of coherent single photons including the efficient out-coupling of the photons from the photonic chip.
Original languageEnglish
JournalPhysical Review B
Volume90
Issue number15
Pages (from-to)155303
Number of pages11
ISSN0163-1829
DOIs
Publication statusPublished - 2014

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