Entanglement crossover close to a quantum critical pointL. Amico and D. Patanè
MATIS CNR-INFM and Dipartimento di Metodologie Fisiche e Chimiche (DMFCI), Università di Catania - viale A. Doria 6, 95125 Catania, Italy
received 6 September 2006; accepted in final form 3 November 2006; published January 2007
published online 27 December 2006
We discuss the thermal entanglement close to a quantum phase transition by analyzing the pairwise entanglement for one-dimensional models in the quantum Ising universality class. We demonstrate that the entanglement sensitivity to thermal and to quantum fluctuations obeys universal -scaling laws. We show that the entanglement exhibits a peculiar universal crossover behaviour, shedding light on the mechanisms bringing quantum criticality up to finite temperatures.
75.10.Jm - Quantized spin models .
03.65.Ud - Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) .
05.30.-d - Quantum statistical mechanics .
© Europhysics Letters Association 2007