title: Finite-key security analyses on passive decoy-state QKD protocols with different unstable sources.
abstract: In quantum communication, passive decoy-state QKD protocols can eliminate many side channels, but the protocols without any finite-key analyses are not suitable for in practice. The finite-key securities of passive decoy-state (PDS) QKD protocols with two different unstable sources, type-II parametric down-convention (PDC) and phase randomized weak coherent pulses (WCPs), are analyzed in our paper. According to the PDS QKD protocols, we establish an optimizing programming respectively and obtain the lower bounds of finite-key rates. Under some reasonable values of quantum setup parameters, the lower bounds of finite-key rates are simulated. The simulation results show that at different transmission distances, the affections of different fluctuations on key rates are different. Moreover, the PDS QKD protocol with an unstable PDC source can resist more intensity fluctuations and more statistical fluctuation.
authors.affiliation: Department of Computer Science, College of Information Science and Technology, Jinan University, Guangzhou, 510632, China.|State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, 100876, China.
authors.forename: Ting-Ting
authors.initials: TT
authors.lastname: Song
authors.affiliation: State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, 100876, China.
authors.forename: Su-Juan
authors.initials: SJ
authors.lastname: Qin
authors.affiliation: State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, 100876, China.
authors.forename: Qiao-Yan
authors.initials: QY
authors.lastname: Wen
authors.affiliation: State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, 100876, China.
authors.forename: Yu-Kun
authors.initials: YK
authors.lastname: Wang
authors.affiliation: School of Information, Central University of Finance and Economics, Beijing, 100081, China.
authors.forename: Heng-Yue
authors.initials: HY
authors.lastname: Jia