Daylight entanglement-based quantum key distribution with a quantum dot source

• URL: http://arxiv.org/abs/2206.15360v1
• Date: Thu, 30 Jun 2022 15:34:40 GMT
• Title: Daylight entanglement-based quantum key distribution with a quantum dot source
• Authors: Francesco Basso Basset, Mauro Valeri, Julia Neuwirth, Emanuele Polino, Michele B. Rota, Davide Poderini, Claudio Pardo, Giovanni Rodari, Emanuele Roccia, Saimon F. Covre da Silva, Giuseppe Ronco, Nicol\`o Spagnolo, Armando Rastelli, Gonzalo Carvacho, Fabio Sciarrino, Rinaldo Trotta
• Abstract summary: We implement a quantum communication protocol during daytime for the first time using a quantum dot source. This technology presents advantages in terms of narrower spectral bandwidth and negligible multiphoton emission at peak brightness.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Entanglement-based quantum key distribution can enable secure communication in trusted node-free networks and over long distances. Although implementations exist both in fiber and in free space, the latter approach is often considered challenging due to environmental factors. Here, we implement a quantum communication protocol during daytime for the first time using a quantum dot source. This technology presents advantages in terms of narrower spectral bandwidth -- beneficial for filtering out sunlight -- and negligible multiphoton emission at peak brightness. We demonstrate continuous operation over the course of three and a half days, across an urban 270-m-long free-space optical link, under different light and weather conditions.

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