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26 April 2024

» arxiv » 1103.0601

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Practical Security of Counterfactual Quantum Cryptography against General Intercept-resend Attacks
Sheng Zhang ; Jian Wang ; Chao-jing Tang ; Quan Zhang ;
Date:	3 Mar 2011
Abstract:	A proof of practical security of counterfactual quantum cryptography(CQC) is presented. First, we obtain a bound tighter than that in Yin’s method[Phys. Rev. A 82, 042335 (2010)], and coinciding with the reality more intuitively based on the fact that the error rates in both three intrinsic events are important for the security. On the other hand, a well -conceived time-shift attack to a practical CQC system with imperfect detectors is proposed to reveal the problem on implementing a secure CQC system in the real world.
Source:	arXiv, 1103.0601
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