Articulo
Thermal entanglement in fully connected spin systems and its random-phase-approximation description
Registro en:
issn:1050-2947
issn:1094-1622
Autor
Matera, Juan Mauricio
Rossignoli, Raúl Dante
Canosa, Norma Beatriz
Institución
Resumen
We examine the thermal pairwise entanglement in a symmetric system of n spins fully connected through anisotropic XYZ-type couplings embedded in a transverse magnetic field. We consider both the exact evaluation together with that obtained with the static path+random phase approximation RPA and the ensuing mean field+RPA. The latter is shown to provide an accurate analytic description of both the parallel and antiparallel thermal concurrence in large systems. We also analyze the limit temperature for pairwise entanglement, which is shown to increase for large fields and to decrease logarithmically with increasing n. Special finite-size effects are also discussed. Quantum Information Research Group Instituto de Física La Plata