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Precise evaluation of leaked information with universal2 privacy amplification in the presence of quantum attacker (1202.0601v3)
Published 3 Feb 2012 in quant-ph, cs.CR, cs.IT, and math.IT
Abstract: We treat secret key extraction when the eavesdropper has correlated quantum states. We propose quantum privacy amplification theorems different from Renner's, which are based on quantum conditional R\'{e}nyi entropy of order 1+s. Using those theorems, we derive an exponential decreasing rate for leaked information and the asymptotic equivocation rate, which have not been derived hitherto in the quantum setting.