光子数分辨诱饵态量子密钥分发
量子物理
2007-05-23 v3
摘要
本文基于近期实验进展，提出了一种光子数分辨诱饵态量子密钥分发方案。给出了多光子脉冲所致计数占比的新上限。该上限与诱饵源强度无关，从而在通信安全性验证后，信号脉冲与诱饵脉冲均可用于生成原始密钥。只要使用弱相干源和高损耗信道，该上限也是多光子脉冲所致计数占比的下限。我们表明，当量子比特误码率较小时，Eve 的相干多光子脉冲（CMP）攻击比对称个体（SI）攻击更高效，因此应考虑 CMP 攻击以确保最终密钥的安全。最后，给出了激光源的最优强度，其使传输距离增加了 23.9 km。03.67.Dd
引用
@article{arxiv.quant-ph/0508099,
title = {Photon-number-solving Decoy State Quantum Key Distribution},
author = {Qing-yu Cai and Yong-gang Tan},
journal= {arXiv preprint arXiv:quant-ph/0508099},
year = {2007}
}
备注
This is a detailed and extended version of quant-ph/0504221. In this paper, a detailed discussion of photon-number-resolving QKD scheme is presented. Moreover, the detailed discussion of coherent multiphoton pulse attack (CMP) is presented. 2 figures and some discussions are added. A detailed cauculation of the "new" upper bound 'is presented