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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| Soggetti: | |
| Accesso online: | https://arxiv.org/abs/2406.14610 |
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| _version_ | 1866917090665955328 |
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| author | Kanitschar, Florian Hajomer, Adnan A. E. Hentschel, Michael Gehring, Tobias Pacher, Christoph |
| author_facet | Kanitschar, Florian Hajomer, Adnan A. E. Hentschel, Michael Gehring, Tobias Pacher, Christoph |
| contents | Establishing scalable, secure quantum networks requires advancing beyond conventional point-to-point quantum key distribution (QKD) protocols toward point-to-multipoint QKD protocols. Here, we generalize a well-established discrete-modulated continuous-variable (CV) QKD protocol from the point-to-point to the point-to-multipoint setting. We present a comprehensive security analysis across four trust scenarios and derive secret key rates for both loss-only and noisy channels, in the asymptotic and composable finite-size regimes. Experimentally, we validate the protocol in a passive optical network with 10 km access links, achieving a composable secure key rate of $2.185 \times 10^{-3}$ bits per symbol (0.273 Mbit/s) against independent and identically distributed collective attacks. Our results demonstrate that discrete-modulated CV-QKD can support access networks with multiple users while relying solely on cost-efficient, off-the-shelf telecommunication components, paving the way toward practical, scalable, and secure quantum networks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_14610 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Composable Continuous-Variable Multi-User QKD with Discrete Modulation: Theory and Implementation Kanitschar, Florian Hajomer, Adnan A. E. Hentschel, Michael Gehring, Tobias Pacher, Christoph Quantum Physics Establishing scalable, secure quantum networks requires advancing beyond conventional point-to-point quantum key distribution (QKD) protocols toward point-to-multipoint QKD protocols. Here, we generalize a well-established discrete-modulated continuous-variable (CV) QKD protocol from the point-to-point to the point-to-multipoint setting. We present a comprehensive security analysis across four trust scenarios and derive secret key rates for both loss-only and noisy channels, in the asymptotic and composable finite-size regimes. Experimentally, we validate the protocol in a passive optical network with 10 km access links, achieving a composable secure key rate of $2.185 \times 10^{-3}$ bits per symbol (0.273 Mbit/s) against independent and identically distributed collective attacks. Our results demonstrate that discrete-modulated CV-QKD can support access networks with multiple users while relying solely on cost-efficient, off-the-shelf telecommunication components, paving the way toward practical, scalable, and secure quantum networks. |
| title | Composable Continuous-Variable Multi-User QKD with Discrete Modulation: Theory and Implementation |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2406.14610 |