20 citations · 49 across the 6 of their papers we have counts for
6 papers
On the long-time asymptotics of quantum dynamical semigroups
Guido A. Raggio, Pablo R. Zangara
We consider semigroups of normal, unital, completely positive maps on a von Neumann algebra . The (predual) semigroup $ν_t (ρ):= ρ\circ α_…
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…
A simple spectral condition implying separability for states of bipartite quantum systems
M. E. Gabach Clement, G. A. Raggio
For two qubits and for general bipartite quantum systems, we give a simple spectral condition in terms of the ordered eigenvalues of the density matrix which guarantees that the co…
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…
Spectral Conditions on the State of a Composite Quantum System Implying its Separability
G. A. Raggio
For any unitarily invariant convex function F on the states of a composite quantum system which isolates the trace there is a critical constant C such that F(w)<= C for a state w i…
Another state entanglement measure
O. A. Nagel, G. A. Raggio
We propose a measure of state entanglement for states of the tensor-product of C*-algebras.