Practical Evaluation of Security for Quantum Key Distribution

Details Practical Evaluation of Security for Quantum Key Distribution Practical Evaluation of Security for Quantum Key Distribution

2006-02-14

arxiv.org/abs/quant-ph/0602113v5

Physical Review A, Vol. 74, 022307 (2006)

Physics

Quantum Physics

The manuscript has been modfied

Scientific paper

10.1103/PhysRevA.74.022307

Many papers proved the security of quantum key distribution (QKD) system, in the asymptotic framework. The degree of the security has not been discussed in the finite coding-length framework, sufficiently. However, to guarantee any implemented QKD system requires, it is needed to evaluate a protocol with a finite coding-length. For this purpose, we derive a tight upper bound of the eavesdropper's information. This bound is better than existing bounds. We also obtain the exponential rate of the eavesdropper's information. Further, we approximate our bound by using the normal distribution.

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