Entanglement in thermal equilibrium states

OMAR OSENDA, GUIDO RAGGIO

PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS

Año: 2005 vol. 72 p. 641021 - 641026

1050-2947

We reconsider the problem of entanglement of thermal equilibrium states of composite systems. We introduce characteristic, viz., critical, temperatures—and bounds for them—marking transitions from entanglement to separability, or vice versa. We present examples for the various possible thermal entanglement scenarios in bipartite qubit-qubit and qubit-qutrit systems.