中国物理B ›› 2008, Vol. 17 ›› Issue (7): 2339-2345.doi: 10.1088/1674-1056/17/7/003
黄利元, 方卯发
Huang Li-Yuan(黄利元) and Fang Mao-Fa(方卯发)†
摘要: The thermal entanglement and teleportation of a thermally mixed entangled state of a two-qubit Heisenberg $XXX$ chain under the Dzyaloshinski--Moriya (DM) anisotropic antisymmetric interaction through a noisy quantum channel given by a Werner state is investigated. The dependences of the thermal entanglement of the teleported state on the DM coupling constant, the temperature and the entanglement of the noisy quantum channel are studied in detail for both the ferromagnetic and the antiferromagnetic cases. The result shows that a minimum entanglement of the noisy quantum channel must be provided in order to realize the entanglement teleportation. The values of fidelity of the teleported state are also studied for these two cases. It is found that under certain conditions, we can transfer an initial state with a better fidelity than that for any classical communication protocol.
中图分类号: (Entanglement and quantum nonlocality)