Li Xiang-Jie, Wang Min, Pan Xing-Bo, Zhang Yun-Rong, Long Gui-Lu
State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China.
Beijing Academy of Quantum Information Sciences, Beijing 100193, China.
Entropy (Basel). 2024 Sep 23;26(9):811. doi: 10.3390/e26090811.
Quantum secure direct communication (QSDC) is a quantum communication paradigm that transmits confidential messages directly using quantum states. Measurement-device-independent (MDI) QSDC protocols can eliminate the security loopholes associated with measurement devices. To enhance the practicality and performance of MDI-QSDC protocols, we propose a one-photon-interference MDI QSDC (OPI-QSDC) protocol which transcends the need for quantum memory, ideal single-photon sources, or entangled light sources. The security of our OPI-QSDC protocol has also been analyzed using quantum wiretap channel theory. Furthermore, our protocol could double the distance of usual prepare-and-measure protocols, since quantum states sending from adjacent nodes are connected with single-photon interference, which demonstrates its potential to extend the communication distance for point-to-point QSDC.
量子安全直接通信（QSDC）是一种量子通信范式，它直接利用量子态传输机密信息。测量设备无关（MDI）的QSDC协议可以消除与测量设备相关的安全漏洞。为了提高MDI-QSDC协议的实用性和性能，我们提出了一种单光子干涉MDI QSDC（OPI-QSDC）协议，该协议无需量子存储器、理想单光子源或纠缠光源。我们还利用量子窃听信道理论分析了OPI-QSDC协议的安全性。此外，我们的协议可以使常规的制备与测量协议的距离翻倍，因为相邻节点发送的量子态通过单光子干涉相连，这表明了其在扩展点对点QSDC通信距离方面的潜力。
