Dynamical pairwise entanglement and two-point correlations in the three-ligand spin-star structure

作者：Motamedifar M^*

来源：Physica A: Statistical Mechanics and Its Applications , 2017, 483: 280-292.

DOI：10.1016/j.physa.2017.04.007

• Quantum W states
• Entanglement dynamics
• Concurrence
• Two-point quantum correlation
• XXX-Heisenberg interactions
• Spin-star structures

We consider the three-ligand spin-star structure through homogeneous Heisenberg interactions (XXX-3LSSS) in the framework of dynamical pairwise entanglement. It is shown that the time evolution of the central qubit "one-particle" state (COPS) brings about the generation of quantum W states at periodical time instants. On the contrary, W states cannot be generated from the time evolution of a ligand "one-particle" state (LOPS). We also investigate the dynamical behavior of two-point quantum correlations as well as the expectation values of the different spin-components for each element in the XXX-3LSSS. It is found that when a W state is generated, the same value of the concurrence between any two arbitrary qubits arises from the xx and yy two-point quantum correlations. On the opposite, zz quantum correlation between any two qubits vanishes at these time instants.

• 出版日期2017-10-1