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Separability Criteria from Uncertainty Relations
Otfried Guehne, Maciej Lewenstein
We explain several separability criteria which rely on uncertainty relations. For the derivation of these criteria uncertainty relations in terms of variances or entropies can be u…
Detecting two-party quantum correlations in quantum key distribution protocols
Marcos Curty, Otfried Gühne, Maciej Lewenstein +1
A necessary precondition for secure quantum key distribution (QKD) is that sender and receiver can prove the presence of entanglement in a quantum state that is effectively distrib…
Unitarity as preservation of entropy and entanglement in quantum systems
Florian Hulpke, Uffe V. Poulsen, Anna Sanpera +3
The logical structure of Quantum Mechanics (QM) and its relation to other fundamental principles of Nature has been for decades a subject of intensive research. In particular, the…
Nonergodicity of entanglement and its complementary behavior to magnetization in infinite spin chain
Aditi Sen De, Ujjwal Sen, Maciej Lewenstein
We consider the problem of the validity of a statistical mechanical description of two-site entanglement in an infinite spin chain described by the XY model Hamiltonian. We show th…
Distributed quantum dense coding
Dagmar Bruss, Giacomo Mauro D'Ariano, Maciej Lewenstein +3
We introduce the notion of distributed quantum dense coding, i.e. the generalization of quantum dense coding to more than one sender and more than one receiver. We show that global…
Entropic uncertainty relations and entanglement
Otfried Guehne, Maciej Lewenstein
We discuss the relationship between entropic uncertainty relations and entanglement. We present two methods for deriving separability criteria in terms of entropic uncertainty rela…
Simplifying Schmidt number witnesses via higher-dimensional embeddings
Florian Hulpke, Dagmar Bruss, Maciej Lewenstein +1
We apply the generalised concept of witness operators to arbitrary convex sets, and review the criteria for the optimisation of these general witnesses. We then define an embedding…