标题： 高速率离散调制连续变量量子密钥分发的可组合安全性 显示英文标题

标题： High-rate discrete-modulated continuous-variable quantum key distribution with composable security

摘要： 连续变量量子密钥分发有望生成高保密密钥速率，使其成为高速率城市量子网络应用的首选方案。 然而，尽管存在这些有前景的机会，实现具有可组合安全性的高速率连续变量量子密钥分发系统仍然是一个难以实现的目标。 在此，我们报告了一种离散调制的连续变量量子密钥分发系统，在25公里光纤信道上对抗集体攻击的可组合保密密钥速率为18.93 Mbps。 这一突破性的速率是通过概率形状的16QAM调制协议实现的，该协议采用半定规划来确保其可组合安全性。 此外，我们采用了一种完全数字化和精确的量子信号处理技术，将过量噪声降低到极低水平，从而促进高效宽带系统运行。 在确保低复杂度和低成本的同时，我们的系统相比之前的连续变量量子密钥分发系统具有数量级上的性能优势，为未来量子密钥分发的部署提供了有前景的解决方案。 显示英文摘要

摘要： 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.