鲁棒的光纤量子密码系统的电子学设计

单模光纤本身存在着极化模式色散效应，使得极化编码方式很难用于光纤量子密码，对此，我们利用极化纠缠光子对实现了一种时间标记的量子密码方案。该方案克服了单模光纤对极化模式集体旋转影响，且不需要校正参考系。简要介绍了这个方案的原理及其实验过程，并着重介绍整个量子密码系统的电子学设计，最后给出了一些主要的实验结果并同理论预言相比较。

Electronics design for the robust quantum cryptography system based on optical fibers

To deal with the effect of polarization mode dispersion in single mode fiber, which makes the polarization encoding unsuitable for the fiber-based quantum cryptography, we implemented the experimental demonstration of a quantum cryptography scheme with timing tags using polarization-entangled photon pairs. This scheme can overcome the influence of collective rotation noise of polarization mode in single mode fiber and can work without shared reference frames. A brief introduction is given to the principles and experimental course of this proposal, followed by a discussion on the electronics design for the whole quantum cryptography system. Finally, some results are given and compared them to the theoretical predicts.