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)
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
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.
Received: 04 April 2006
Revised: 04 September 2006
Accepted manuscript online:
Fund: 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).
Cite this article:
Zhang Yong(张勇), Liu Dan(刘丹), and Long Gui-Lu(龙桂鲁) Ground-state entanglement in a three-spin transverse Ising model with energy current 2007 Chinese Physics 16 324
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