Solid-state ensemble of highly entangled photon sources at rubidium atomic transitions

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Keil, R.; Zopf, M.; Chen, Y.; Höfer, B.; Zhang, J. et al.: Solid-state ensemble of highly entangled photon sources at rubidium atomic transitions. In: Nature Communications 8 (2017), 15501. DOI:

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Sum total of downloads: 264

Semiconductor InAs/GaAs quantum dots grown by the Stranski-Krastanov method are among the leading candidates for the deterministic generation of polarization-entangled photon pairs. Despite remarkable progress in the past 20 years, many challenges still remain for this material, such as the extremely low yield, the low degree of entanglement and the large wavelength distribution. Here, we show that with an emerging family of GaAs/AlGaAs quantum dots grown by droplet etching and nanohole infilling, it is possible to obtain a large ensemble of polarization-entangled photon emitters on a wafer without any post-growth tuning. Under pulsed resonant two-photon excitation, all measured quantum dots emit single pairs of entangled photons with ultra-high purity, high degree of entanglement and ultra-narrow wavelength distribution at rubidium transitions. Therefore, this material system is an attractive candidate for the realization of a solid-state quantum repeater - among many other key enabling quantum photonic elements. © The Author(s) 2017.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2017
Appears in Collections:Fakultät für Mathematik und Physik

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pos. country downloads
total perc.
1 image of flag of Germany Germany 162 61.36%
2 image of flag of France France 34 12.88%
3 image of flag of United States United States 21 7.95%
4 image of flag of Canada Canada 19 7.20%
5 image of flag of China China 9 3.41%
6 image of flag of No geo information available No geo information available 2 0.76%
7 image of flag of Russian Federation Russian Federation 2 0.76%
8 image of flag of Switzerland Switzerland 2 0.76%
9 image of flag of India India 1 0.38%
10 image of flag of Belgium Belgium 1 0.38%
    other countries 11 4.17%

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