Florian Kanitschar

Oct 10, 2023 | link.aps.org | Florian Kanitschar |Technische Universität Wien |Ian George |Jie Lin

Popular Summary Quantum key distribution (QKD) enables two remote parties to establish a shared secret key even in the presence of an eavesdropper that has access to a quantum computer. The obtained key then can be used to encrypt secret messages. Continuous-variable QKD (CV-QKD) protocols with discrete modulation (DM) are promising candidates for commercial implementations because the required components are already used in current telecommunications infrastructure.

Feb 21, 2023 | link.aps.org | Michael Liu |Amherst College |Florian Kanitschar |Technische Universität Wien

Abstract We derive a Lipschitz continuity bound for quantum-classical conditional entropies with respect to angular distance, with a Lipschitz constant that is independent of the dimension of the conditioning system. This bound is sharper in some situations than previous continuity bounds, which were either based on trace distance (where Lipschitz continuity is not possible), or based on angular distance but did not include a conditioning system.