基于偏振的量子密钥分发系统中多个半导体激光器产生随机比特的临界边道效应
Critical side channel effects in random bit generation with multiple semiconductor lasers in a polarization-based quantum key distribution system
摘要：
大多数基于偏振的BB84量子密钥分发（QKD）系统利用多个激光器随机产生四个偏振量子态中的一个。然而，使用多个激光器的随机比特生成可能会打开关键的侧信道，这严重危及QKD系统的安全性。本文研究了多个半导体激光器工作时可能存在的时间视差和强度起伏的不被注意的边通道。实验结果表明，边信道会严重降低QKD系统的安全性能。通过实验结果进一步讨论了提高量子误码率与激光驱动条件有关的一个重要系统问题。
英文摘要：
Most polarization-based BB84 quantum key distribution (QKD) systems utilize multiple lasers to generate one of four polarization quantum states randomly. However, random bit generation with multiple lasers can potentially open critical side channels, which significantly endangers the security of QKD systems. In this paper, we show unnoticed side channels of temporal disparity and intensity fluctuation, which possibly exist in the operation of multiple semiconductor laser diodes. Experimental results show that the side channels can enormously degrade security performance of QKD systems. An important system issue for the improvement of quantum bit error rate (QBER) related with laser driving condition is furtherly addressed with experimental results.
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