Abstract
The manuscript intend to offer a solution to the security loophole induced by the wave-length dependence of the fibre beam splitter loss. The lower bound of the final secure key rate generated by a practical QKD system is theoretically deduced via analysis on the quantum key error rate influenced by wave-length dependence of the fibre beam splitter. Thus, we made up the security loophole pretty well, and provide a solution to similar quantum hack scheme.
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