Quantum discord for a central two-qubit system coupled to an XY spin chain with Dzyaloshinsky-Moriya interaction

被引：11
作者：
Qiu, Liang [1 ]
Wang, An Min [2 ]
机构：
[1] China Univ Min & Technol, Dept Phys, Xuzhou 221116, Peoples R China
[2] Univ Sci & Technol China, Dept Modern Phys, Hefei 230026, Peoples R China
来源：
PHYSICA SCRIPTA | 2011年 / 84卷 / 04期
基金：
中国国家自然科学基金;
关键词：
SUDDEN-DEATH; ENTANGLEMENT; STATES;
D O I：
10.1088/0031-8949/84/04/045021
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigated the quantum discord dynamics of a central two-qubit system coupled to an XY spin chain with the Dzyaloshinsky-Moriya (DM) interaction. We found that the DM interaction does not affect the behavior of the quantum phase transition induced by the external magnetic field. Moreover, the DM interaction enhances the decay of quantum discord in the weak-coupling regime, while it has no obvious effect on the quantum discord dynamics in the strong-coupling regime.
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页数：6
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共 40 条
  • [1] Quantum versus Classical Correlations in Gaussian States
    Adesso, Gerardo
    Datta, Animesh
    [J]. PHYSICAL REVIEW LETTERS, 2010, 105 (03)
  • [2] Entanglement in many-body systems
    Amico, Luigi
    Fazio, Rosario
    Osterloh, Andreas
    Vedral, Vlatko
    [J]. REVIEWS OF MODERN PHYSICS, 2008, 80 (02) : 517 - 576
  • [3] TELEPORTING AN UNKNOWN QUANTUM STATE VIA DUAL CLASSICAL AND EINSTEIN-PODOLSKY-ROSEN CHANNELS
    BENNETT, CH
    BRASSARD, G
    CREPEAU, C
    JOZSA, R
    PERES, A
    WOOTTERS, WK
    [J]. PHYSICAL REVIEW LETTERS, 1993, 70 (13) : 1895 - 1899
  • [4] QUANTUM CRYPTOGRAPHY USING ANY 2 NONORTHOGONAL STATES
    BENNETT, CH
    [J]. PHYSICAL REVIEW LETTERS, 1992, 68 (21) : 3121 - 3124
  • [5] Decoherence from spin environment: Role of the Dzyaloshinsky-Moriya interaction
    Cheng, W. W.
    Liu, J. -M.
    [J]. PHYSICAL REVIEW A, 2009, 79 (05):
  • [6] Chuang I. N., 2000, Quantum Computation and Quantum Information
  • [7] Correlations in the Grover search
    Cui, Jian
    Fan, Heng
    [J]. JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL, 2010, 43 (04)
  • [8] Decoherence effects in interacting qubits under the influence of various environments
    Das, Sumanta
    Agarwal, G. S.
    [J]. JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS, 2009, 42 (20)
  • [9] Entanglement and the power of one qubit
    Datta, A
    Flammia, ST
    Caves, CM
    [J]. PHYSICAL REVIEW A, 2005, 72 (04):
  • [10] Quantum discord and the power of one qubit
    Datta, Animesh
    Shaji, Anil
    Caves, Carlton M.
    [J]. PHYSICAL REVIEW LETTERS, 2008, 100 (05)
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