Daylight entanglement-based quantum key distribution with a quantum dot source
| Autor: | F Basso Basset, M Valeri, J Neuwirth, E Polino, M B Rota, D Poderini, C Pardo, G Rodari, E Roccia, S F Covre da Silva, G Ronco, N Spagnolo, A Rastelli, G Carvacho, F Sciarrino, R Trotta |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
Quantum Physics
Physics and Astronomy (miscellaneous) Condensed Matter - Mesoscale and Nanoscale Physics quantum key distribution Materials Science (miscellaneous) quantum dot entanglement free-space optical communication atmospheric effects FOS: Physical sciences Atomic and Molecular Physics and Optics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) Electrical and Electronic Engineering Quantum Physics (quant-ph) |
| Popis: | 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. The first two authors contributed equally to this work. 10 pages, 3 figures |
| Databáze: | OpenAIRE |
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