Quantum cryptography
Quantum cryptography
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DOI：
10.1007/s003400050574
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
H. Zbinden;H. Bechmann-Pasquinucci;N. Gisin;G. Ribordy
中科院分区：
文献类型：
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作者：
H. Zbinden;H. Bechmann-Pasquinucci;N. Gisin;G. Ribordy
在简要介绍了经典密码学之后，我们将详细解释量子密码学的工作原理。然后，我们给出了一种基于法拉第镜的自平衡干涉仪的优雅的实验实现。这种相位编码装置不需要干涉仪的对准，也不需要偏振控制，因此极大地方便了实验。此外，它还具有出色的条纹可见性。接下来，我们估计量子密码学的实用极限。文中说明了探测器噪声的重要性，并提出了降低噪声的方法。利用当今的技术，以100赫兹的比特率实现最大距离约70公里是可以实现的。
After a short introduction to classic cryptography we explain thoroughly how quantum cryptography works. We present then an elegant experimental realization based on a self-balanced interferometer with Faraday mirrors. This phase-coding setup needs no alignment of the interferometer nor polarization control, and therefore considerably facilitates the experiment. Moreover it features excellent fringe visibility. Next, we estimate the practical limits of quantum cryptography. The importance of the detector noise is illustrated and means of reducing it are presented. With present-day technologies maximum distances of about 70 km with bit rates of 100 Hz are achievable.