1.9k citations · 4k across the 48 of their papers we have counts for
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Generalized W-state of four qubits with exclusively threetangle
Sebastian Gartzke, Andreas Osterloh
We single out a class of states possessing only threetangle but distributed all over four qubits. This is a three-site analogue of states from the -class, which only possess glo…
Exact zeros of entanglement for arbitrary rank-two mixtures: how a geometric view of the zero-polytope makes life more easy
Andreas Osterloh
Here I present a method how intersections of a certain density matrix of rank two with the zero-polytope can be calculated exactly. This is a purely geometrical procedure which the…
Avalanche of entanglement and correlations at quantum phase transitions
Konstantin V. Krutitsky, Andreas Osterloh, Ralf Schützhold
We study the ground-state entanglement in the quantum Ising model with nearest neighbor ferromagnetic coupling and find a sequential increase of entanglement depth with growing…
Strong monogamy inequalities for four qubits
Bartosz Regula, Andreas Osterloh, Gerardo Adesso
We investigate possible generalizations of the Coffman-Kundu-Wootters monogamy inequality to four qubits, accounting for multipartite entanglement in addition to the bipartite term…
The fourtangle in the transverse XY model
Andreas Osterloh, Ralf Schützhold
We analyze the entanglement measure for mixed states in general and for the transverse XY model. We come to the conclusion that it cannot serve alone for guaranteeing an enta…
Upper bound for SL-invariant entanglement measures of mixed states
Andreas Osterloh
An algorithm is proposed that serves to handle full rank density matrices, when coming from a lower rank method to compute the convex-roof. This is in order to calculate an upper b…