ENTANGLEMENT IN THERMAL EQUILIBRIUM STATES

ANALIA ZWICK, OMAR OSENDA, GUIDO RAGGIO

BUENOS AIRES

Congreso; 13 INTERNATIONAL CONFERENCE "RECENT PROGRESS IN MANY-BODY THEORIES"- QMBT 13; 2005

We revisit the problem of entanglement of thermal equilibrium states of composite systems. We introduce characteristic, viz. critical, temperatures marking transitions fromentanglement to separability or vice versa. We present examples for the various possible thermal entanglement scenarios, resulting from the presence of several transitions,  in bipartitequbit/qutrit systems and bipartite sub--systems of larger ones.