869 citations · 10.9k across the 170 of their papers we have counts for
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Entanglement of Collectively Interacting Harmonic Chains
R. G. Unanyan, M. Fleischhauer, D. Bruss
We study the ground-state entanglement of one-dimensional harmonic chains that are coupled to each other by a collective interaction as realized e.g. in an anisotropic ion crystal.…
Entanglement witnesses and a loophole problem
Patrick Skwara, Hermann Kampermann, Matthias Kleinmann +1
We consider a possible detector-efficiency loophole in experiments that detect entanglement via the local measurement of witness operators. Here, only local properties of the detec…
Purifying and Reversible Physical Processes
Matthias Kleinmann, Hermann Kampermann, Tim Meyer +1
Starting from the observation that reversible processes cannot increase the purity of any input state, we study deterministic physical processes, which map a set of states to a set…
Finite key analysis for symmetric attacks in quantum key distribution
Tim Meyer, Hermann Kampermann, Matthias Kleinmann +1
We introduce a constructive method to calculate the achievable secret key rate for a generic class of quantum key distribution protocols, when only a finite number n of signals is…