Entanglement in the quantum Heisenberg XY model
Entanglement in the quantum Heisenberg XY model
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DOI:
10.1103/physreva.64.012313
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发表时间:
2001-01
影响因子:
2.9
通讯作者:
Xiaoguang Wang
中科院分区:
文献类型:
--
作者:
Xiaoguang Wang
We study the entanglement in the quantum Heisenberg $\mathrm{XY}$ model in which the so-called W entangled states can be generated for 3 or 4 qubits. By the concept of concurrence, we study the entanglement in the time evolution of the $\mathrm{XY}$ model. We investigate the thermal entanglement in the two-qubit isotropic $\mathrm{XY}$ model with a magnetic field and in the anisotropic $\mathrm{XY}$ model, and find that the thermal entanglement exists for both ferromagnetic and antiferromagnetic cases. Some evidences of the quantum phase transition also appear in these simple models.