Position-controlled Telecom Single Photon Emitters Operating at Elevated Temperatures

• URL: http://arxiv.org/abs/2210.12833v2
• Date: Fri, 28 Oct 2022 10:52:09 GMT
• Title: Position-controlled Telecom Single Photon Emitters Operating at Elevated Temperatures
• Authors: Patrick Laferri\`ere, Sofiane Haffouz, David B. Northeast, Philip J. Poole, Robin L. Williams and Dan Dalacu
• Abstract summary: We demonstrate high purity single photon emission at 1.31 mum using deterministically positioned InP photonic waveguide nanowires containing single InAsP quantum dot-in-a-rod structures. These results are a promising step towards scalably fabricating telecom single photon emitters that operate under relaxed cooling requirements.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Single photon emitters are a key component for enabling the practical use of quantum key distribution protocols for secure communications. For long-haul optical networks it is imperative to use photons at wavelengths that are compatible with standard single mode fibers: 1.31 {\mu}m and 1.55 {\mu}m. We demonstrate high purity single photon emission at 1.31 {\mu}m using deterministically positioned InP photonic waveguide nanowires containing single InAsP quantum dot-in-a-rod structures. At 4 K the detected count rate in fiber was 1.9 Mcps under above-band pulsed laser excitation at 80 MHz corresponding to a single photon collection efficiency at the first lens of 25%. At this count rate, the probability of multiphoton emission is g(2)(0) = 0.021. We have also evaluated the performance of the source as a function of temperature. Multiphoton emission probability increases with temperature with values of 0.11, 0.34 and 0.57 at 77 K, 220 K and 300 K, respectively, which is attributed to an overlap of temperature-broadened excitonic emission lines. These results are a promising step towards scalably fabricating telecom single photon emitters that operate under relaxed cooling requirements.

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