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arXiv quant-ph/0503057quant-ph
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基于实际设备的量子密钥分发的安全性

Security of Quantum Key Distribution with Realistic Devices

Xiongfeng Ma

摘要:

模拟了量子密钥分发(QKD)的实验装置,并对QKD过程进行了改进。介绍了一种新的数据后处理协议,主要包括纠错和隐私放大。该协议结合了GLLP和诱饵状态的思想,本质上只需要调高或调低源功率。我们提出了一种实用的方法来执行诱饵状态的方法,它主要遵循Lo的诱饵状态的思想。然后,提出了一种新的数据后处理协议。我们首先研究了改进的QKD方案中光源的最佳期望光子数μ。与原最优传输效率mu =O(eta)相比,得到了新的最优传输效率mu=O(1),其中eta为总传输效率。利用该协议,我们可以将密钥生成速率从传输效率的二次型O(eta 2)提高到O(eta)。基于最近的实验设置,我们获得了超过140公里的最大安全传输距离。

英文摘要:

We simulate quantum key distribution (QKD) experimental setups and give out some improvement for QKD procedures. A new data post-processing protocol is introduced, mainly including error correction and privacy amplification. This protocol combines the ideas of GLLP and the decoy states, which essentially only requires to turn up and down the source power. We propose a practical way to perform the decoy state method, which mainly follows the idea of Lo's decoy state. A new data post-processing protocol is then developed for the QKD scheme with the decoy state. We first study the optimal expected photon number mu of the source for the improved QKD scheme. We get the new optimal mu=O(1) comparing with former mu=O(eta), where eta is the overall transmission efficiency. With this protocol, we can then improve the key generation rate from quadratic of transmission efficiency O(eta2) to O(eta). Based on the recent experimental setup, we obtain the maximum secure transmission distance of over 140 km.

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