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

• URL: http://arxiv.org/abs/2003.06117v1
• Date: Fri, 13 Mar 2020 05:12:38 GMT
• Title: Efficient fiber in-line single photon source based on colloidal single quantum dots on an optical nanofiber
• Authors: K. Muhammed Shafi, Kali P. Nayak, Akiharu Miyanaga and Kohzo Hakuta
• Abstract summary: We show that a charged state (trion) of the single quantum dot exhibits a photo-stable emission of single photons with high quantum efficiency. The device can be easily integrated to the fiber networks paving the way for potential applications in quantum networks.
• Score: 0.0
• License: http://creativecommons.org/publicdomain/zero/1.0/
• 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 ($10.0\pm0.5$ 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 $16\pm2\%$ with a maximum photon count rate of $1.6\pm0.2$ MHz and a high single photon purity ($g^2(0)=0.11\pm0.02$). The device can be easily integrated to the fiber networks paving the way for potential applications in quantum networks.

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