Daylight entanglement-based quantum key distribution with a quantum dot source
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Valeri, M
Neuwirth, J
Polino, E
Rota, MB
Poderini, D
Pardo, C
Rodari, G
Roccia, E
da Silva, SF Covre
Ronco, G
Spagnolo, N
Rastelli, A
Carvacho, G
Sciarrino, F
et al.
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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.
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Quantum Science and Technology
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8
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2
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© 2023 The Author(s). Published by IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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Quantum physics
Science & Technology
Physical Sciences
Quantum Science & Technology
Physics, Multidisciplinary
Physics
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Basset, FB; Valeri, M; Neuwirth, J; Polino, E; Rota, MB; Poderini, D; Pardo, C; Rodari, G; Roccia, E; da Silva, SFC; Ronco, G; Spagnolo, N; Rastelli, A; Carvacho, G; Sciarrino, F; Trotta, R, Daylight entanglement-based quantum key distribution with a quantum dot source, Quantum Science and Technology, 2023, 8 (2), pp. 025002