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arXiv 2402.02709quant-ph
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基于预告式单光子源的被动诱骗态量子安全直接通信

Passive decoy-state quantum secure direct communication with heralded single-photon source

Jia-Wei Ying, Peng Zhao, Wei Zhong, Ming-Ming Du, Xi-Yun Li, Shu-Ting Shen, An-Lei Zhang, Lan Zhou, Yu-Bo Sheng

AI总结:

针对不完善光子源限制量子安全直接通信(QSDC)实用化的问题,提出基于预告式单光子源的被动诱骗态QSDC协议,显著提升保密消息容量与通信距离,推动实用化QSDC系统发展。

摘要:

量子安全直接通信(QSDC)无需密钥即可通过量子信道直接传输秘密信息。光子源不完善是QSDC实际应用的主要障碍。不完善光子源发射的非预期真空态和多光子成分会大幅降低QSDC的保密消息容量,甚至威胁其安全性。本文提出了一种基于预告式单光子源(HSPS)的高效被动诱骗态QSDC协议。我们采用自发参量下转换源在两个空间模式中发射纠缠光子对,通过探测两个关联空间模式中一个模式的光子,可推断另一个模式的光子数分布。同时,本协议可实现信号态和诱骗态的简单被动制备。HSPS能有效降低真空态概率,提升QSDC的保密消息容量;被动诱骗态方法可简化实验操作,增强QSDC抵御第三方侧信道攻击的鲁棒性。在10 km通信距离下,当平均光子数为0.1时,本QSDC协议的保密消息容量是无HSPS的原始单光子QSDC协议的81.85倍;当平均光子数为0.01时,是其12.79倍。在平均光子数为0.01时,本QSDC协议的最大通信距离更长,约为17.975 km。本研究为实用被动诱骗态QSDC系统的进一步发展迈出了重要一步。

英文摘要:

Quantum secure direct communications (QSDC) can directly transmit secret messages through a quantum channel without keys. The imperfect photon source is a major obstacle for QSDC's practical implementation. The unwanted vacuum state and multiphoton components emitted from imperfect photon source largely reduce QSDC's secrecy message capacity and even threaten its security. In the paper, we propose a high-efficient passive decoy-state QSDC protocol with the heralded single-photon source (HSPS). We adopt a spontaneous parametric down-conversion source to emit entangled photon pairs in two spatial modes. By detecting the photons in one of the two correlated spatial modes, we can infer the photon-number distribution of the other spatial mode. Meanwhile, our protocol allows a simple passive preparation of the signal states and decoy state. The HSPS can effectively reduce the probability of vacuum state and increase QSDC's secrecy message capacity. Meanwhile, the passive decoy-state method can simplify the experimental operations and enhance QSDC's robustness against the third-party side-channel attacks. Under the communication distance of 10 km, the secrecy message capacity of our QSDC protocol can achieve 81.85 times with average photon number of 0.1 and 12.79 times with average photon number of 0.01 of that in the original single-photon-based QSDC protocol without the HSPS. Our QSDC protocol has longer maximal communication distance about 17.975 km with average photon number of 0.01. Our work serves as a major step toward the further development of practical passive decoy-state QSDC systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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