Volume 77, Number 1, January 2007
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 December 2006|
Entanglement crossover close to a quantum critical point
MATIS CNR-INFM and Dipartimento di Metodologie Fisiche e Chimiche (DMFCI), Università di Catania - viale A. Doria 6, 95125 Catania, Italy
Accepted: 3 November 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.
PACS: 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
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