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quant-ph2007★ 12 cited
Two-spin subsystem entanglement in spin 1/2 rings with long range interactions
M. Gaudiano, O. Osenda, G. A. Raggio
We consider the two-spin subsystem entanglement for eigenstates of the Hamiltonian \[ H= \sum_{1\leq j< k \leq N} (\frac{1}{r_{j,k}})^α {\mathbf σ}_j\cdot {\mathbf σ}_k \] for a ri…
quant-ph2005
Entanglement in thermal equilibrium states
O. Osenda, G. A. Raggio
We revisist the issue of entanglement of thermal equilibrium states in composite quantum systems. The possible scenarios are exemplified in bipartite qubit/qubit and qubit/qutrit s…