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 days, across an urban 270 m-long free-space optical link, under different light and weather conditions.
Daylight entanglement-based quantum key distribution with a quantum dot source / Basso Basset, F; Valeri, M; Neuwirth, J; Polino, E; Rota, M; Poderini, D; Pardo, C; Rodari, G; Roccia, E; da Silva, Sfc; Ronco, G; Spagnolo, N; Rastelli, A; Carvacho, G; Sciarrino, F; Trotta, R. - In: QUANTUM SCIENCE AND TECHNOLOGY. - ISSN 2058-9565. - 8:2(2023). [10.1088/2058-9565/acae3d]
Daylight entanglement-based quantum key distribution with a quantum dot source
Basso Basset, F;Valeri, M;Neuwirth, J;Rota, M;Rodari, G;Ronco, G;Spagnolo, N;Carvacho, G;Sciarrino, F;Trotta, R
2023
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 days, across an urban 270 m-long free-space optical link, under different light and weather conditions.File | Dimensione | Formato | |
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