Quantum Entanglement and Discord Dynamics of two Noninteracting Spin Qubits in Two Independent Spin Baths

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• 作者：Lan Xu ; Guiping Wu ; Lin Yan
• 关键词：Quantum entanglement ; Quantum discord ; Quantum correlation
• 刊名：International Journal of Theoretical Physics
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：56
• 期：3
• 页码：874-886
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics, general; Quantum Physics; Elementary Particles, Quantum Field Theory; Theoretical, Mathematical and Computational Physics;
• 出版者：Springer US
• ISSN：1572-9575
• 卷排序：56

文摘

We study the dynamics of quantum entanglement and quantum discord between two non-interacting qubits, which couple with two independent spin baths, obeying the XXZ Hamiltonian. After the Holstein-Primakoff transformation, one could reduce the spin bath to a single-mode bosonic bath field. Then we use this model to study the entanglement and discord dynamics of two qubits in their corresponding spin bath. For the initial Werner state, it is indicated that both entanglement and quantum discord exhibit death and revival behavior, while the quantum correlations change more smaller.