| Issue |
EPL
Volume 77, Number 1, January 2007
|
|
|---|---|---|
| Article Number | 17001 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/77/17001 | |
| 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
Received:
6
September
2006
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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