中国物理B ›› 2007, Vol. 16 ›› Issue (2): 324-328.doi: 10.1088/1009-1963/16/2/009

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Ground-state entanglement in a three-spin transverse Ising model with energy current

张勇1, 刘丹1, 龙桂鲁2   

  1. (1)Key Laboratory For Quantum Information and Measurements and Department of Physics, Tsinghua University, Beijing 100084, China; (2)Key Laboratory For Quantum Information and Measurements and Department of Physics, Tsinghua University, Beijing 100084, China \sj b) Key Laboratory for Atomic and Molecular NanoSciences, Tsinghua University, Beijing 100084, China
  • 收稿日期:2006-04-04 修回日期:2006-09-04 出版日期:2007-02-20 发布日期:2007-02-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 10447116) and the Science Foundation for Post Doctorate of China (Grant No 2005038316).

Ground-state entanglement in a three-spin transverse Ising model with energy current

Zhang Yong(张勇)a)†, Liu Dan(刘丹)a), and Long Gui-Lu(龙桂鲁)a)b)   

  1. a Key Laboratory For Quantum Information and Measurements and Department of Physics, Tsinghua University, Beijing 100084, China; b Key Laboratory for Atomic and Molecular NanoSciences, Tsinghua University, Beijing 100084, China
  • Received:2006-04-04 Revised:2006-09-04 Online:2007-02-20 Published:2007-02-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 10447116) and the Science Foundation for Post Doctorate of China (Grant No 2005038316).

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摘要： The ground-state entanglement associated with a three-spin transverse Ising model is studied. By introducing an energy current into the system, a quantum phase transition to energy-current phase may be presented with the variation of external magnetic field; and the ground-state entanglement varies suddenly at the critical point of quantum phase transition. In our model, the introduction of energy current makes the entanglement between any two qubits become maximally robust.

关键词: entanglement, energy current, quantum phase transition

Abstract: The ground-state entanglement associated with a three-spin transverse Ising model is studied. By introducing an energy current into the system, a quantum phase transition to energy-current phase may be presented with the variation of external magnetic field; and the ground-state entanglement varies suddenly at the critical point of quantum phase transition. In our model, the introduction of energy current makes the entanglement between any two qubits become maximally robust.

Key words: entanglement, energy current, quantum phase transition

中图分类号:  (Entanglement and quantum nonlocality)

  • 03.65.Ud
03.67.Mn (Entanglement measures, witnesses, and other characterizations) 05.50.+q (Lattice theory and statistics)