标题： 由Yuen 2000协议设计和实验的量子流密码：基于强度调制方案的设计和实验 显示英文标题

标题： Quantum stream cipher by Yuen 2000 protocol: Design and experiment by intensity modulation scheme

摘要： 本文将研究Yuen协议，即所谓的Y-00，该协议可以实现高比特率（Gbps）的随机化流密码，适用于长距离（数百公里）传输。 本文中基于Y-00利用量子噪声进行随机化的随机流密码被称为量子流密码，并且它可能对已知明文攻击具有安全性，这种安全性与任何传统的对称密钥密码都没有类似之处。 我们提出了一种基于攻击者的外差测量和量子无模糊测量的简单密码分析方法，以明确Y-00在实际通信中的优势。 此外，我们给出了强度调制方案的实现设计，并报告了通过20公里长传输线实现1 Gbps量子流密码的实验演示。 显示英文摘要

摘要： This paper shall investigate Yuen protocol, so called Y-00, which can realize a randomized stream cipher with high bit rate(Gbps) for long distance(several hundreds km). The randomized stream cipher with randomization by quantum noise based on Y-00 is called quantum stream cipher in this paper, and it may have security against known plaintext attacks which has no analog with any conventional symmetric key ciphers. We present a simple cryptanalysis based on an attacker's heterodyne measurement and the quantum unambiguous measurement to make clear the strength of Y-00 in real communication. In addition, we give a design for the implementation of an intensity modulation scheme and report the experimental demonstration of 1 Gbps quantum stream cipher through 20 km long transmission line.