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

Robert Keil, Michael Zopf, Yan Chen, Bianca Höfer, Jiaxiang Zhang, Fei Ding () and Oliver G. Schmidt
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Robert Keil: Institute for Integrative Nanosciences, IFW Dresden
Michael Zopf: Institute for Integrative Nanosciences, IFW Dresden
Yan Chen: Institute for Integrative Nanosciences, IFW Dresden
Bianca Höfer: Institute for Integrative Nanosciences, IFW Dresden
Jiaxiang Zhang: Institute for Integrative Nanosciences, IFW Dresden
Fei Ding: Institute for Integrative Nanosciences, IFW Dresden
Oliver G. Schmidt: Institute for Integrative Nanosciences, IFW Dresden

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract 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.

Date: 2017
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DOI: 10.1038/ncomms15501

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