Quantum key distribution over a 48 km optical fibre network
Quantum key distribution over a 48 km optical fibre network
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DOI：
10.1080/09500340008244058
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发表时间：
1999-04
影响因子：
1.3
通讯作者：
Richard J. Hughes;G. Morgan;C. G. Peterson
中科院分区：
文献类型：
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作者：
Richard J. Hughes;G. Morgan;C. G. Peterson
秘密随机比特序列被称为“密钥”材料，其安全分配是将其用于保密通信的加密和解密的必要前提。量子密码学是一种通过单光子传输进行安全密钥分发的新技术：海森堡的不确定性原理确保对手既不能成功窃听密钥传输，也不能逃避检测（窃听将密钥错误率提高到阈值以上）。我们已经开发了实验量子密码系统的基础上传输的非正交光子状态，以产生共享的密钥材料超过数公里的光纤路径和视线的链接。在这两种情况下，密钥材料都是使用初始秘密随机序列的每比特的单光子传输来构建的。该序列的量子力学随机子集被识别，在与发送者的数据协调阶段之后成为密钥材料。在这里，我们报告了我们的光纤实验的最新结果，在该实验中，我们使用光子干涉态与B92和BB84量子密钥分配协议在洛斯阿拉莫斯的48公里光纤网络上进行了量子密钥分配。
Abstract The secure distribution of the secret random bit sequences known as ‘key’ material, is an essential precursor to their use for the encryption and decryption of confidential communications. Quantum cryptography is a new technique for secure key distribution with single-photon transmissions: Heisenberg's uncertainty principle ensures that an adversary can neither successfully tap the key transmissions, nor evade detection (eavesdropping raises the key error rate above a threshold value). We have developed experimental quantum cryptography systems based on the transmission of non-orthogonal photon states to generate shared key material over multikilometre optical fibre paths and over line-of-sight links. In both cases, key material is built up using the transmission of a single-photon per bit of an initial secret random sequence. A quantum-mechanically random subset of this sequence is identified, becoming the key material after a data reconciliation stage with the sender. Here we report the most recent results of our optical fibre experiment in which we have performed quantum key distribution over a 48 km optical fibre network at Los Alamos using photon interference states with the B92 and BB84 quantum key distribution protocols.