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quant-ph2015★ 7 cited
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…
quant-ph2015★ 6 cited
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…
quant-ph2015★ 7 cited
The nine ways of four qubit entanglement and their threetangle
Andreas Osterloh
I calculate the mixed threetangle for the reduced density matrices of the four-qubit representant states found in Phys. Rev. A {\bf 65}, 052112 (2002). In most of the case…