| Original Articles |
|
|
|
|
Entanglement of Two-Qubit Quantum Heisenberg XYZ Chain |
| XI Xiao-Qiang1,2;HAO San-Ru1;CHEN Wen-Xue2;YUE Rui-Hong1 |
| 1Institute of Modern Physics, Northwest University,
Xi’an 710069
2Fundamental Department of Xi’an Institute of Posts and Telecommunications, Xi’an 710061 |
|
| Cite this article: |
|
XI Xiao-Qiang, HAO San-Ru, CHEN Wen-Xue et al 2002 Chin. Phys. Lett. 19 1044-1047 |
|
|
|
|
Abstract We derive the analytic expression of the concurrence in the quantum Heisenberg XYZ model and discuss the influence of parameters J, Δ, and Γ on the concurrence. By choosing different values Γ and Δ, we obtain the XX, XY, XXX and XXZ chains. The concurrence decreases with increasing temperature. When T → 0, the concurrence reaches its maximum value 1, i.e., the entangled state, | > = √2/2 (|01> - |10>), is maximum entanglement. For the XXZ chain, when Γ → ∞, the concurrence will meet its maximum value Cmax = sinh(1/T)/cosh(1/T).
|
| Keywords:
03.65.Ud
03.67.Lx
75.10.Jm
|
|
|
Published: 01 August 2002
|
|
| PACS: |
03.65.Ud
|
(Entanglement and quantum nonlocality)
|
| |
03.67.Lx
|
(Quantum computation architectures and implementations)
|
| |
75.10.Jm
|
(Quantized spin models, including quantum spin frustration)
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
