期刊
NATURE PHOTONICS
卷 13, 期 12, 页码 839-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41566-019-0504-5
关键词
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资金
- Singapore Ministry of Education (MOE) [MOE2017-T3-1-001]
- Singapore National Research Foundation (NRF) National Natural Science Foundation of China (NSFC) [NRF2017NRF-NSFC002-014]
- Singapore National Research Foundation [NRF-CRP13-2014-01]
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.
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