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Efficient fiber in-line single photon source based on colloidal single quantum dots on an optical nanofiber

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Abstract

We demonstrate a fiber in-line single photon source based on a hybrid system of colloidal single quantum dots deposited on an optical nanofiber and cooled down to cryogenic temperature (3.7 K). We show that a charged state (trion) of the single quantum dot exhibits a photo-stable emission of single photons with high quantum efficiency, narrow linewidth (3 meV FWHM) and fast decay time (\(10.0\pm 0.5\) ns). The single photons are efficiently coupled to the guided modes of the nanofiber and eventually to a single mode optical fiber. The brightness (efficiency) of the single photon source is estimated to be \(16\pm 2\%\) with a maximum photon count rate of \(1.6\pm \,0.2\) MHz and a high single photon purity (\(g^2(0)=0.11\pm 0.02\)). The device can be easily integrated to the fiber networks paving the way for potential applications in quantum networks.

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Acknowledgements

This work was supported by the Japan Science and Technology Agency (JST) through Strategic Innovation Program (Grant No. JPMJSV0918). We acknowledge the contributions of Kazunori Iida and Emi Tsutsumi, in the preparation of the thick shell quantum dot samples.

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Authors and Affiliations

  1. Center for Photonic Innovations and Institute for Laser Science, University of Electro-Communications, Chofu-Shi, Tokyo, 182-8585, Japan

    K. Muhammed Shafi, Kali P. Nayak & Kohzo Hakuta

  2. NS Materials Inc., Tsukushino, Fukuoka, 818-0042, Japan

    Akiharu Miyanaga

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  1. K. Muhammed Shafi
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  2. Kali P. Nayak
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Correspondence to Kali P. Nayak.

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Shafi, K.M., Nayak, K.P., Miyanaga, A. et al. Efficient fiber in-line single photon source based on colloidal single quantum dots on an optical nanofiber. Appl. Phys. B 126, 58 (2020). https://doi.org/10.1007/s00340-020-7407-5

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  • DOI: https://doi.org/10.1007/s00340-020-7407-5

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