High-rate discrete-modulated continuous-variable quantum key distribution with composable security
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866909537487814656 |
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| author | Wu, Mingze Pan, Yan Li, Junhui Wang, Heng Fan, Lu Shao, Yun Li, Yang Huang, Wei Yu, Song Xu, Bingjie Zhang, Yichen |
| author_facet | Wu, Mingze Pan, Yan Li, Junhui Wang, Heng Fan, Lu Shao, Yun Li, Yang Huang, Wei Yu, Song Xu, Bingjie Zhang, Yichen |
| contents | Continuous-variable quantum key distribution holds the potential to generate high secret key rates, making it a prime candidate for high-rate metropolitan quantum network applications. However, despite these promising opportunities, the realization of high-rate continuous-variable quantum key distribution systems with composable security remains an elusive goal. Here, we report a discrete-modulated continuous-variable quantum key distribution system with a composable secret key rate of 18.93 Mbps against collective attacks over a 25 km fiber channel. This record-breaking rate is achieved through the probability shaped 16QAM-modulated protocol, which employs semidefinite programming to ensure its composable security. Furthermore, we have employed a fully digital and precise quantum signal processing technique to reduce excess noise to extremely low levels, thereby facilitating efficient broadband system operation. While ensuring low complexity and cost, our system achieves a performance advantage of over an order of magnitude compared to previous continuous-variable quantum key distribution systems, providing a promising solution for future deployment of quantum key distribution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_11431 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | High-rate discrete-modulated continuous-variable quantum key distribution with composable security Wu, Mingze Pan, Yan Li, Junhui Wang, Heng Fan, Lu Shao, Yun Li, Yang Huang, Wei Yu, Song Xu, Bingjie Zhang, Yichen Quantum Physics Continuous-variable quantum key distribution holds the potential to generate high secret key rates, making it a prime candidate for high-rate metropolitan quantum network applications. However, despite these promising opportunities, the realization of high-rate continuous-variable quantum key distribution systems with composable security remains an elusive goal. Here, we report a discrete-modulated continuous-variable quantum key distribution system with a composable secret key rate of 18.93 Mbps against collective attacks over a 25 km fiber channel. This record-breaking rate is achieved through the probability shaped 16QAM-modulated protocol, which employs semidefinite programming to ensure its composable security. Furthermore, we have employed a fully digital and precise quantum signal processing technique to reduce excess noise to extremely low levels, thereby facilitating efficient broadband system operation. While ensuring low complexity and cost, our system achieves a performance advantage of over an order of magnitude compared to previous continuous-variable quantum key distribution systems, providing a promising solution for future deployment of quantum key distribution. |
| title | High-rate discrete-modulated continuous-variable quantum key distribution with composable security |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2503.11431 |