New passive decoy-state quantum key distribution with thermal distributed parametric down-conversion source

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• 作者：Jie Wei ; Chun-Hui Zhang ; Qin Wang
• 关键词：Quantum key distribution ; Decoy state ; Parametric down ; conversion source ; Weak coherent state
• 刊名：Quantum Information Processing
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：16
• 期：2
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Quantum Information Technology, Spintronics; Quantum Computing; Data Structures, Cryptology and Information Theory; Quantum Physics; Mathematical Physics;
• 出版者：Springer US
• ISSN：1573-1332
• 卷排序：16

文摘

We present a new scheme on implementing the passive quantum key distribution with thermal distributed parametric down-conversion source. In this scheme, only one-intensity decoy state is employed, but we can achieve very precise estimation on the single-photon-pulse contribution by utilizing those built-in decoy states. Moreover, we compare the new scheme with other practical methods, i.e., the standard three-intensity decoy-state BB84 protocol using either weak coherent states or parametric down-conversion source. Through numerical simulations, we demonstrate that our new scheme can drastically improve both the secure transmission distance and the key generation rate.