On-demand single photons with high extraction efficiency and near-unity indistinguishability from a resonantly driven quantum dot in a micropillar
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Scalable photonic quantum technologies require on-demand single-photon sources with simultaneously high levels of purity, indistinguishability, and efficiency. These key features, however, have only been demonstrated separately in previous experiments. Here, by s-shell pulsed resonant excitation of a Purcell-enhanced quantum dot-micropillar system, we deterministically generate resonance fluorescence single photons which, at π pulse excitation, have an extraction efficiency of 66%, single-photon purity of 99.1%, and photon indistinguishability of 98.5%. Such a single-photon source for the first time combines the features of high efficiency and near-perfect levels of purity and indistinguishabilty, and thus opens the way to multiphoton experiments with semiconductor quantum dots.
Ding , X , He , Y , Duan , Z -C , Gregersen , N , Chen , M -C , Unsleber , S , Maier , S , Schneider , C , Kamp , M , Höfling , S , Lu , C Y & Pan , J-W 2016 , ' On-demand single photons with high extraction efficiency and near-unity indistinguishability from a resonantly driven quantum dot in a micropillar ' Physical Review Letters , vol 116 , no. 2 , 020401 . DOI: 10.1103/PhysRevLett.116.020401
Physical Review Letters
© 2016 American Physical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work which was originally published at http://dx.doi.org/10.1103/PhysRevLett.116.020401
This work was supported by the National Natural Science Foundation of China, the Chinese Academy of Sciences, and the National Fundamental Research Program. We acknowledge financial support by the State of Bavaria and the German Ministry of Education and Research (BMBF) within the projects Q.com-H and the Chist-era project SSQN. N. G. acknowledges support from the Danish Research Council for Technology and Production.
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