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A novel realization of quantum stream cipher with key-modulated local light

机译：密钥调制局部光的量子流密码的新实现

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摘要

Quantum-noise stream cipher (QSC) is a potentially information-theoretic secure physical-layer encryption method for high-speed and long-distance fiber communications. In this paper, a novel QSC scheme employing Y-00 protocol is proposed and experimentally demonstrated under general commercial components. The structure of our scheme can provide a convenience for general researchers to perform QSC experimental studies. Specifically, at receiver, the local light is modulated by M/2-ary extended secret key, which is introduced as optical threshold signal, and the balanced photodetector is applied as optical comparator to decode the M-ary encrypted signal. As a result, the error-free secure communication is realized at 2.5 Gb/s over 100-km optically amplified links, where the intensity levels of QSC signals are attained to 1024. Meanwhile, in strict theory, the minimum number of masked levels by only quantum noise is calculated to be more than two, which indicates the security of this realization. The system performance is investigated from both experimental and theoretical results. We reveal the new fact that the increasing number of signal levels will degrade the QSC BER performance for intensity modulation, which is different from that for phase modulation.
机译：量子噪声流密码（QSC）是一种潜在的信息论安全物理层加密方法，用于高速和长距离光纤通信。在本文中，提出了一种采用Y-00协议的新型QSC方案，并在一般商业组件下进行了实验证明。我们计划的结构可以为一般研究人员进行QSC实验研究提供便利。具体地，在接收器处，本地光由作为光阈值信号引入的M / 2进制扩展密钥来调制，并且平衡光电检测器用作光学比较器以对M进制加密信号进行解码。结果，在100 km的光放大链路上以2.5 Gb / s的速度实现了无差错的安全通信，其中QSC信号的强度级别达到了1024。只有量子噪声被计算为大于两个，这表明此实现的安全性。从实验和理论两个方面研究了系统性能。我们揭示了一个新的事实，即信号电平数量的增加将降低强度调制的QSC BER性能，这与相位调制的性能不同。

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