Zhou Lan, Sheng Yu-Bo, Long Gui-Lu
School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210003, China.
Key Lab of Broadband Wireless Communication and Sensor Network Technology, Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing 210003, China; Institute of Quantum Information and Technology, Nanjing University of Posts and Telecommunications, Nanjing 210003, China.
Sci Bull (Beijing). 2020 Jan 15;65(1):12-20. doi: 10.1016/j.scib.2019.10.025. Epub 2019 Nov 4.
"Device-independent" not only represents a relaxation of the security assumptions about the internal working of the quantum devices, but also can enhance the security of the quantum communication. In the paper, we put forward the first device-independent quantum secure direct communication (DI-QSDC) protocol and analyze its security and communication efficiency against collective attacks. Under practical noisy quantum channel condition, the photon transmission loss and photon state decoherence would reduce DI-QSDC's communication quality and threaten its absolute security. For solving the photon transmission loss and decoherence problems, we adopt noiseless linear amplification (NLA) protocol and entanglement purification protocol (EPP) to modify the DI-QSDC protocol. With the help of the NLA and EPP, we can guarantee DI-QSDC's absolute security and effectively improve its communication quality.
“与设备无关”不仅意味着放宽对量子设备内部工作的安全假设，还能增强量子通信的安全性。在本文中，我们提出了首个与设备无关的量子安全直接通信（DI-QSDC）协议，并分析了其针对集体攻击的安全性和通信效率。在实际有噪声的量子信道条件下，光子传输损耗和光子态退相干会降低DI-QSDC的通信质量并威胁其绝对安全性。为了解决光子传输损耗和退相干问题，我们采用无噪声线性放大（NLA）协议和纠缠纯化协议（EPP）来修改DI-QSDC协议。借助NLA和EPP，我们能够保证DI-QSDC的绝对安全性并有效提高其通信质量。
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