Erratum: Continuous Variable Quantum Key Distribution: Finite-Key Analysis of Composable Security Against Coherent Attacks Phys. Rev. Lett. 109, 100502 (2012)

摘要

We provide a security analysis for continuous variable quantum keydistribution protocols based on the transmission of squeezed vacuum statesmeasured via homodyne detection. We employ a version of the entropicuncertainty relation for smooth entropies to give a lower bound on the numberof secret bits which can be extracted from a finite number of runs of theprotocol. This bound is valid under general coherent attacks, and gives rise tokeys which are composably secure. For comparison, we also give a lower boundvalid under the assumption of collective attacks. For both scenarios, we findpositive key rates using experimental parameters reachable today.