The present work arises from a joint collaboration between the IHFG, the 3rd Institute of Physics and the Max Planck institute for solid state research. The final scope was the quantum hybrid interface between high quality single photons from a semiconductor quantum dot and efficient filters based on alkali atomic vapors. Cs atoms have been used to realize a so-called “Faraday anomalous dispersion optical filter” (FADOF) which is very well known and largely used by the atomic physics community. This filter, based on the Faraday effect, has been utilized as high performance two-color filter. Single photons coming from the Mollow triplet were generated via a strong continuous-wave resonant pumping and sent throughout the FADOF. Only the photons interacting with the atomic vapors can be transmitted while all other wavelengths undergo a strong rejection. Due to the intrinsic tunability of the Mollow triplet spectrum, the photons coming from the sidebands where tuned in resonance with the atomic transitions and therefore simultaneously transmitted, while the central Rayleigh line together with the unwanted laser scattering were largely suppressed. This work appears to be of high interest for the implementation of quantum networks.
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Opli, the magazine of Electro – Optics, Imaging and Machine Vision, Medical engineering, Photonics, Physics, and Solar Energy.
http://www.opli.net/opli_magazine/eo/2016/integrating-quantum-dots-and-atomic-vapors-nov-news/
Publication: Simultaneous Faraday filtering of the Mollow triplet sidebands with the Cs-D1 clock transition
Simone Luca Portalupi, Matthias Widmann, Cornelius Nawrath, Michael Jetter, Peter Michler, Jörg Wrachtrup, Ilja Gerhardt 
Nature Communications 7, 13632 (2016)
Contact person: Dr. Simone Luca Portalupi