Experimental free-space quantum secure direct communication and its security analysis
Experimental free-space quantum secure direct communication and its security analysis
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DOI：
10.1364/prj.388790
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发表时间：
2020-09-01
影响因子：
7.6
通讯作者：
Long, Gui Lu
中科院分区：
文献类型：
--
作者：
Pan, Dong;Lin, Zaisheng;Long, Gui Lu
我们报告了一种基于单光子的自由空间量子安全直接通信的实验实现。量子通信方案采用相位编码，对非对称马赫-曾德尔干涉仪进行了优化，以自动补偿光子在自由空间介质中跃迁时的相位漂移。在16 MHz脉冲重复频率下，在10 m自由空间内实现了500 bps的信息传输速率，平均量子比特误码率为0.49% +/- 0.27%。分析了Eve在去极化信道中对单光子态进行集体攻击，对多光子态进行光子数分裂攻击的安全性。结果表明，量子安全直接通信在自由空间中是可行的。(C) 2020中国激光出版社
We report an experimental implementation of free-space quantum secure direct communication based on single photons. The quantum communication scheme uses phase encoding, and the asymmetric Mach-Zehnder interferometer is optimized so as to automatically compensate phase drift of the photons during their transitions over the free-space medium. At a 16 MHz pulse repetition frequency, an information transmission rate of 500 bps over a 10 m free space with a mean quantum bit error rate of 0.49% +/- 0.27% is achieved. The security is analyzed under the scenario that Eve performs the collective attack for single-photon state and the photon number splitting attack for multi-photon state in the depolarizing channel. Our results show that quantum secure direct communication is feasible in free space. (C) 2020 Chinese Laser Press