Universally-composable finite-key analysis for efficient four-intensity decoy-state quantum key distributionHaodong Jiang, Ming Gao, Bao Yan, Weilong Wang and Zhi MaEur. Phys. J. D, 70 4 (2016) 78DOI: https://doi.org/10.1140/epjd/e2016-60655-2