Analysis of counterfactual quantum key distribution using error-correcting theory
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Counterfactual quantum key distribution is an interesting direction in quantum cryptography and has been realized by some researchers. However, it has been pointed that its insecure in information theory when it is used over a high lossy channel. In this paper, we retry its security from a error-correcting theory point of view. The analysis indicates that the security flaw comes from the reason that the error rate in the users’ raw key pair is as high as that under the Eve’s attack when the loss rate exceeds 50 %.
KeywordsQuantum key distribution Counterfactual Error correcting
We are very grateful to Professor Horace P. Yuen for encouragement. This work is supported by NSFC (Grant Nos. 61300181, 61272057, 61202434, 61170270, 61100203, 61121061, 61370188, and 61103210), Beijing Natural Science Foundation (Grant No. 4122054), and Beijing Higher Education Young Elite Teacher Project (Grant Nos. YETP0475, YETP0477), China scholarship council.
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