目前量子密钥分发所面临的最主要问题是如何实现远距离、高码率量子密钥传输.为提高量子保密通信系统量子密钥生成的速率,提出一种反射和位移相结合的技术对已有的码率较低的量子密钥进行扩展处理,提高量子密钥库的容量.实验结果表明,采用反射技术和位移技术不但能有效地扩展量子密钥随机序列,同时可以保持良好的随机性,是一种扩展量子密钥库的有效方法.
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