An integrated silicon photonic chip platform for continuous-variable quantum key distribution
An integrated silicon photonic chip platform for continuous-variable quantum key distribution
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DOI：
10.1038/s41566-019-0504-5
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发表时间：
2019-12-01
期刊：
影响因子：
35
通讯作者：
Liu, A. Q.
中科院分区：
文献类型：
--
作者：
Zhang, G.;Haw, J. Y.;Liu, A. Q.
量子密钥分发（QKD）是一种承诺无条件通信安全的量子通信技术。高性能且经济高效的 QKD 系统对于建立量子通信网络至关重要(1-3)。通过将所有光学元件（激光源除外）集成在硅光子芯片上，我们实现了稳定、小型化和低成本的连续可变 QKD（CV-QKD）系统，该系统与现有光纤通信基础设施兼容（4）。此处，演示了用于 CV-QKD 的集成硅光子芯片。它实现了广泛研究的高斯调制相干态协议，该协议对激光正交的连续分布信息进行编码 (5,6)。我们基于原理验证芯片的 CV-QKD 系统能够在 100 公里的光纤模拟距离上产生 0.14 kbps 的密钥速率（在集体攻击下），为低成本、可扩展和便携式量子网络提供了新的可能性。
Quantum key distribution (QKD) is a quantum communication technology that promises unconditional communication security. High-performance and cost-effective QKD systems are essential for the establishment of quantum communication networks(1-3). By integrating all the optical components (except the laser source) on a silicon photonic chip, we have realized a stable, miniaturized and low-cost system for continuous-variable QKD (CV-QKD) that is compatible with the existing fibre optical communication infrastructure(4). Here, the integrated silicon photonic chip is demonstrated for CV-QKD. It implements the widely studied Gaussian-modulated coherent state protocol that encodes continuous distributed information on the quadrature of laser light(5,6). Our proof-of-principle chip-based CV-QKD system is capable of producing a secret key rate of 0.14 kbps (under collective attack) over a simulated distance of 100 km in fibre, offering new possibilities for low-cost, scalable and portable quantum networks.