Journal article · Preprint article
Efficient out-coupling of high-purity single photons from a coherent quantum dot in a photonic-crystal cavity
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.
Language: | English |
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Year: | 2014 |
Pages: | 13 |
ISSN: | 1550235x , 10980121 , 01631829 and 24699950 |
Types: | Journal article and Preprint article |
DOI: | 10.1103/PhysRevB.90.155303 |
ORCIDs: | 0000-0002-0991-041X and 0000-0002-9348-9591 |