Quantum correlations in spin models

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• 作者：Guo-Feng  ; Zhang^a ;   ; ^b ;   ; ^{gf1978zhang@buaa.edu.cn} ; Heng  ; Fan^b ; Ai-Ling  ; Ji^b ; Zhao-Tan  ; Jiang^c ; Ahmad  ; Abliz^d ; Wu-Ming  ; Liu^b
• 关键词：Bell nonlocality ; Entanglement ; Measurement-induced disturbance (MID) ; Spin model
• 刊名：Annals of Physics
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：326
• 期：10
• 页码：2694-2701
• 全文大小：542 K

文摘

Bell nonlocality, entanglement and nonclassical correlations are different aspects of quantum correlations for a given state. There are many methods to measure nonclassical correlations. In this paper, nonclassical correlations in two-qubit spin models are measured by the use of measurement-induced disturbance (MID) [S. Luo, Phys. Rev. A 77 (2008) 022301] and geometric measure of quantum discord (GQD) [B. Daki?, V. Vedral, C. Brukner, Phys. Rev. Lett. 105 (2010) 190502]. Their dependences on external magnetic field, spin¨Cspin coupling, and the Dzyaloshinskii¨CMoriya (DM) interaction are presented in detail. We also compare Bell nonlocality, entanglement measured by concurrence, MID and GQD and illustrate their different characteristics.