Impact of Fiber Dispersion on Performance of Entanglement-Based Dispersive Optics Quantum Key Distribution  

作　　者：Jing-Yuan Liu Xu Liu Wei Zhang Yi-Dong Huang 

机构地区：[1]with the Department of Electronic Engineering,Tsinghua University,Beijing 100084 [2]with the Beijing National Research Center for Information Science and Technology,Tsinghua University,Beijing 100084 [3]with the Beijing Innovation Center for Future Chips,Tsinghua University,Beijing 100084 [4]with Frontier Science Center for Quantum Information,Beijing 100084 [5]with Beijing Academy of Quantum Information Sciences,Beijing 100193

出　　处：《Journal of Electronic Science and Technology》2021年第4期297-307,共11页电子科技学刊（英文版）

基　　金：the National Key R&D Program of China under Grants No.2017YFA0303704 and No.2018YFB2200400;Natural Science Foundation of Beijing under Grant No.Z180012;National Natural Science Foundation of China under Grants No.61875101 and No.91750206.

摘　　要：Dispersive optics quantum key distribution(DO-QKD)based on energy-time entangled photon pairs is an important QKD scheme.In DO-QKD,the arrival time of photons is used in key generation and security analysis,which would be greatly affected by fiber dispersion.In this work,we establish a theoretical model of the entanglement-based DO-QKD system,considering the protocol,physical processes(such as fiber transmission and single-photon detection),and the analysis of security tests.Based on this theoretical model,we investigate the influence of chromatic dispersion introduced by transmission fibers on the performance of DO-QKD.By analyzing the benefits and costs of dispersion compensation,the system performance under G.652 and G.655 optical fibers are shown,respectively.The results show that dispersion compensation is unnecessary for DO-QKD systems in campus networks and even metro networks.Whereas,it is still required in DO-QKD systems with longer fiber transmission distances.

关 键 词：Dispersion compensation dispersive optics quantum key distribution(DO-QKD) fiber chromatic dispersion quantum networks. 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]