Resonance fluorescence from an atomic-quantum-memory compatible single photon source based on GaAs droplet quantum dots
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Single photon sources, which are compatible with quantum memories are an important component of quantum networks. In this article, we show optical investigations on isolated GaAs/Al0.25Ga0.75As quantum dots grown via droplet epitaxy, which emit single photons on resonance with the Rb-87-D2 line (780 nm). Under continuous wave resonant excitation conditions, we observe bright, clean and narrowband resonance fluorescence emission from such a droplet quantum dot. Furthermore, the second-order correlation measurement clearly demonstrates the single photon emission from this resonantly driven transition. Spectrally resolved resonance fluorescence of a similar quantum dot yields a linewidth as narrow as 660 MHz (2.7 μeV ), which corresponds to a coherence time of 0.482 ns. The observed linewidth is the smallest reported so far for strain free GaAs quantum dots grown via the droplet method. We believe that this single photon source can be a prime candidate for applications in optical quantum networks.
Tripathi , L N , He , Y-M , Dusanowski , Ł , Wroński , P A , Lu , C-Y , Schneider , C & Höfling , S 2018 , ' Resonance fluorescence from an atomic-quantum-memory compatible single photon source based on GaAs droplet quantum dots ' , Applied Physics Letters , vol. 113 , no. 2 , 021102 . https://doi.org/10.1063/1.5034402
Applied Physics Letters
© 2018 The Author(s). Published by AIP Publishing. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1063/1.5034402
DescriptionThis project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 721394. We furthermore gratefully acknowledge support by the State of Bavaria.
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