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arXiv · 2207.12898

High emission rate from a Purcell-enhanced, triggered source of pure single photons in the telecom C-band

Cornelius Nawrath·Raphael Joos·Sascha Kolatschek·Stephanie Bauer·Pascal Pruy·Florian Hornung·Julius Fischer·Jiasheng Huang·Ponraj Vijayan·Robert Sittig·Michael Jetter·Simone Luca Portalupi·Peter Michler
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Abstract

Several emission features mark semiconductor quantum dots as promising non-classical light sources for prospective quantum implementations. For long-distance transmission [1] and Si-based on-chip processing[2, 3], the possibility to match the telecom C-band [4] stands out, while source brightness and high single-photon purity are key features in virtually any quantum implementation [5, 6]. Here we present an InAs/InGaAs/GaAs quantum dot emitting in the telecom C-band coupled to a circular Bragg grating. The Purcell enhancement of the emission enables a simultaneously high brightness with a fiber-coupled single-photon count rate of 13.9MHz for an excitation repetition rate of 228MHz (first-lens collection efficiency ca. 17% for NA = 0.6), while maintaining a low multi-photon contribution of g(2)(0) = 0.0052. Moreover, the compatibility with temperatures of up to 40K attainable with compact cryo coolers, further underlines the suitability for out-of-the-lab implementations.

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Cornelius Nawrath, Raphael Joos, Sascha Kolatschek, Stephanie Bauer, Pascal Pruy, Florian Hornung, Julius Fischer, Jiasheng Huang, Ponraj Vijayan, Robert Sittig, Michael Jetter, Simone Luca Portalupi, Peter Michler. 2022-07-26. High emission rate from a Purcell-enhanced, triggered source of pure single photons in the telecom C-band. https://arxiv.org/abs/2207.12898

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