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Secret communication over public channels is one of the central pillars of amodern information society. Using quantum key distribution (QKD) this isachieved without relying on the hardness of mathematical problems which mightbe compromised by improved algorithms or by future quantum computers.State-of-the-art QKD requires composable security against coherent attacks fora finite number of samples. Here, we present the first implementation of QKDsatisfying this requirement and additionally achieving security which isindependent of any possible flaws in the implementation of the receiver. Bydistributing strongly Einstein-Podolsky-Rosen entangled continuous variable(CV) light in a table-top arrangement, we generated secret keys using a highlyefficient error reconciliation algorithm. Since CV encoding is compatible withconventional optical communication technology, we consider our work to be amajor promotion for commercialized QKD providing composable security againstthe most general channel attacks.

Implementation of Quantum Key Distribution with Composable Security Against Coherent Attacks using Einstein-Podolsky-Rosen Entanglement