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密钥协商是量子密钥分发(QKD)中的重要组成部分.Cascade协议是实际中使用最广泛的量子密钥协商协议.本文基于[6]的工作提出一种对Cascade协议的改进方案.计算机仿真显示我们的方案比原始Cascade和一些其它改进方案有更高的效率. 相似文献
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A realizable quantum encryption algorithm for qubits is presented by employing bit-wise quantum computation. System extension and bit-swapping are introduced into the encryption process, which makes the ciphertext space expanded greatly. The security of the proposed algorithm is analysed in detail and the schematic physical implementation is also provided. It is shown that the algorithm, which can prevent quantum attack strategy as well as classical attack strategy, is effective to protect qubits. Finally, we extend our algorithm to encrypt classical binary bits and quantum entanglements. 相似文献