Plug-and-play dual-phase-modulated continuous-variable quantum key distribution with photon subtraction
作者机构：School of Automation Central South University Changsha 410083 China
出 版 物：《Frontiers of physics》 (物理学前沿（英文版）)
年 卷 期：2019年第14卷第4期
页 面：131-141页
核心收录：
基 金：National Natural Science Foundation of China [61379153 61572529]
主 题：plug-and-play dual-phase-modulated continuous variable quantum key distribution photon subtraction
摘 要：Plug-and-play dual-phase-modulated continuous-variable quantum key distribution (CVQKD) protocol can effectively solve the security loopholes associated with transmitting local oscillator (LO). However, this protocol has larger excess noise compared with one-way Gaussian-modulated coherent-states scheme, which limits the maximal transmission distance to a certain degree. In this paper, we show a reliable solution for this problem by employing non-Gaussian operation, especially, photon subtraction operation, which provides a way to improve the performance of plug-and-play dual-phase-modulated CVQKD protocol. The photon subtraction operation shows experimental feasibility in the plug-andplay configuration since it can be implemented under current technology. Security results indicate that the photon subtraction operation can evidently enhance the maximal transmission distance of the plug-and-play dual-phase-modulated CVQKD protocol, which effectively makes up the drawback of the original one. Furthermore, we achieve the tighter bound of the transmission distance by considering the finite-size effect, which is more practical compared with that achieved in the asymptotic limit.
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