Quantum coherence and correlation dynamics of two-qubit system in spin bath environment |
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| Authors: | Hao Yang Li-Guo Qin Li-Jun Tian Hong-Yang Ma |
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| Affiliation: | (Department of Physics,Shanghai University,Shanghai 200444,China;School of Mathematics,Physics and Statistics,Shanghai University of Engineering Science,Shanghai 201620,China;Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201210,China;School of Science,Qingdao University of Technology,Qingdao 266000,China) |
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| Abstract: | The quantum entanglement, discord, and coherence dynamics of two spins in the model of a spin coupled to a spin bath through an intermediate spin are studied. The effects of the important physical parameters including the coupling strength of two spins, the interaction strength between the intermediate spin and the spin bath, the number of bath spins and the temperature of the system on quantum coherence and correlation dynamics are discussed in different cases. The frozen quantum discord can be observed whereas coherence does not when the initial state is the Bell-diagonal state. At finite temperature, we find that coherence is more robust than quantum discord, which is better than entanglement, in terms of resisting the influence of environment. Therefore, quantum coherence is more tenacious than quantum correlation as an important resource. |
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