Quantum and Classical Correlations in Isotropic XY Chain with Three-Site Interaction |
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| Authors: | LIU Ben-Qiong SHAO Bin ZOU Jian |
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| Affiliation: | Key Laboratory of Cluster Science of Ministry of Education, and Department of Physics, Beijing Institute of Technology, Beijing 100081, China |
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| Abstract: | The quantum phase transition in the isotropic XY chain with three-site interaction has been studied by calculating the quantum discord, classical correlation, and concurrence measuring entanglement. It is found that the quantum discord is a better choice than concurrence to signal the presence of the quantum phase transition in this model, since that for next-nearest neighbor spins the derivative of the quantum discord still exhibits singularity at the critical point while there is no more entanglement. |
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| Keywords: | quantum discord concurrence quantum phase transition |
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