Coexistence of multiuser entanglement distribution and classical light in optical fiber network with a semiconductor chip  

作　　者：Xu Jing Cheng Qian Xiaodong Zheng Hu Nian Chenquan Wang Jie Tang Xiaowen Gu Yuechan Kong Tangsheng Chen Yichen Liu Chong Sheng Dong Jiang Bin Niu Liangliang Lu 

机构地区：[1]National Key Laboratory of Solid-State Microwave Devices and Circuits,Nanjing Electronic Devices Institute,Nanjing 210016,China [2]Key Laboratory of Optoelectronic Technology of Jiangsu Province,School of Physical Science and Technology,Nanjing Normal University,Nanjing 210023,China [3]National Laboratory of Solid-State Microstructures,Nanjing University,Nanjing 210093,China [4]Research Center for Quantum Optics and Quantum Communication,School of Science,Qingdao University of Technology,Qingdao 266520,China [5]School of Internet,Anhui University,Hefei 230039,China [6]Hefei National Laboratory,Hefei 230088,China

出　　处：《Chip》2024年第2期1-10,共10页芯片（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.12274233,12174187,62288101);Cheng Qian acknowledges financial support from the Postgraduate Research&Practice Innovation Program of Jiangsu Province(SJCX23_0569).

摘　　要：Building communication links among multiple users in a scalable and robust way is a key objective in achieving large-scale quantum networks.In a realistic scenario,noise from the coexisting classical light is inevitable and can ultimately disrupt the entanglement.The previous significant fully connected multiuser entanglement distribution experiments are conducted using dark fiber links,and there is no explicit relation between the entanglement degradations induced by classical noise and its error rate.Here,a semiconductor chip with a high figure-of-merit modal overlap is fabricated to directly generate broadband polarization entanglement.The monolithic source maintains the polarization entanglement fidelity of above 96%for 42 nm bandwidth,with a brightness of 1.2×10^(7)Hz mW^(−1).A continuously working quantum entanglement distribution are performed among three users coexisting with classical light.Under finite-key analysis,secure keys are established and images encryption are enabled as well as quantum secret sharing between users.This work paves the way for practical multiparty quantum communication with integrated photonic architecture compatible with real-world fiber optical communication network.

关 键 词：Quantum key distribution Semiconductor chip Raman noise Image encryption 

分 类 号：TN3[电子电信—物理电子学]