QUANTUM CORRELATIONS OF TWO QUBITS COUPLED IN A THERMAL EQUILIBRIUM ENVIRONMENT

被引：0
|
作者：
Zhang, Aiping [1 ,2 ]
Li, Fuli [1 ]
机构：
[1] Xi An Jiao Tong Univ, Dept Appl Phys, Xian 710049, Peoples R China
[2] Xian Univ Architecture & Technol, Dept Phys, Xian 710055, Peoples R China
来源：
MODERN PHYSICS LETTERS B | 2012年 / 26卷 / 25期
关键词：
Thermal equilibrium environment; quantum correlations; INFORMATION; STATE;
D O I：
10.1142/S0217984912501655
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Quantum correlations (including entanglement and quantum discord) of two qubits symmetrically coupled to the surrounding XY spin chain in the presence of a transverse magnetic field are studied. We investigate the dynamic evolution of the quantum correlations of the two qubits when the surrounding spin chain is in the thermal equilibrium state. Numerical results show that the thermal effects can accelerate the decay process of the quantum correlations if the initial state of the composite system is not in the decoherence free space. When the temperature is high enough, the quantum phase transition driven by the external magnetic field completely disappear.
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页数：12
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