Continuous-variable quantum key distribution with on-chip light sources  

作　　者：LANG LI TAO WANG XINHANG LI PENG HUANG YUYAO GUO LIANGJUN LU LINJIE ZHOU GUIHUA ZENG 

机构地区：[1]State Key Laboratory of Advanced Optical Communication Systems and Networks,Center for Quantum Sensing and Information Processing,Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [2]Shanghai Research Center for Quantum Sciences,Shanghai 201315,China [3]State Key Laboratory of Advanced Optical Communication Systems and Networks,Shanghai Key Laboratory of Navigation and Location Services,Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [4]SJTU-Pinghu Institute of Intelligent Optoelectronics,Pinghu 314200,China

出　　处：《Photonics Research》2023年第4期504-516,共13页光子学研究（英文版）

基　　金：Special Project for Research and Development in Key areas of Guangdong Province(2020B030304002);Shanghai Municipal Science and Technology Major Project(2019SHZDZX01);National Natural Science Foundation of China(61671287,61971276,62101320);National Key Research and Development Program of China(2016YFA0302600)。

摘　　要：Integrated quantum key distribution(QKD)systems based on photonic chips have high scalability and stability,and are promising for further construction of global quantum communications networks.On-chip quantum light sources are a critical component of a fully integrated QKD system;especially a continuous-variable QKD(CVQKD)system based on coherent detection,which has extremely high requirements for the light sources.Here,for what we believe is the first time,we designed and fabricated two on-chip tunable lasers for CV-QKD,and demonstrated a high-performance system based on these sources.Because of the high output power,fine tunability,and narrow linewidth,the involved on-chip lasers guarantee the accurate shot-noise-limited detection of quantum signals,center wavelength alignment of nonhomologous lasers,and suppression of untrusted excess noise.The system’s secret key rate can reach 0.75 Mb/s at a 50 km fiber distance,and the secure transmission distance can exceed 100 km.Our results mark a breakthrough toward building a fully integrated CV-QKD,and pave the way for a reliable and efficient terrestrial quantum-secure metropolitan area network.

关 键 词：QUANTUM SOURCES distribution 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]