QUANTUM DISCORD IN THE GROUND STATE OF SPIN CHAINS

被引：38
|
作者：
Sarandy, Marcelo S. [1 ]
De Oliveira, Thiago R. [1 ]
Amico, Luigi [2 ,3 ]
机构：
[1] Univ Fed Fluminense, Inst Fis, BR-24210346 Niteroi, RJ, Brazil
[2] CNR MATIS IMM, I-95125 Catania, Italy
[3] Univ Catania, Dipartimento Fis & Astron, I-95125 Catania, Italy
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS B | 2013年 / 27卷 / 1-3期
关键词：
Quantum information; quantum phase transitions; quantum discord; STATISTICAL-MECHANICS; XY-MODEL; ENTANGLEMENT;
D O I：
10.1142/S0217979213450306
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The ground state of a quantum spin chain is a natural playground for investigating correlations. Nevertheless, not all correlations are genuinely of quantum nature. Here we review the recent progress to quantify the "quantumness" of the correlations throughout the phase diagram of quantum spin systems. Focusing to one spatial dimension, we discuss the behavior of quantum discord (QD) close to quantum phase transitions (QPT). In contrast to the two-spin entanglement, pairwise discord is effectively long-ranged in critical regimes. Besides the features of QPT, QD is especially feasible to explore the factorization phenomenon, giving rise to nontrivial ground classical states in quantum systems. The effects of spontaneous symmetry breaking are also discussed as well as the identification of quantum critical points through correlation witnesses.
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页数：24
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