Entanglement Teleportation via Two-Qubit Spin Squeezing Model

Entanglement teleportation via two spins coupled to each other by one axis twisting spin squeezing interaction is investigated. We mainly concentrate on the properties of the channel entanglement, the output entanglement and the teleportation fidelity. It shows that the output entanglement increases linearly with increasing the value of the input entanglement. With the increasing of T, the teleportated entanglement increases sharply from zero to a maximum value and then decreases slowly to zero when the temperature is improved to one threshold value of Tc, and the threshold value of Tc increases with the increasing of the input entanglement. When enlarging the external magnetic, Fa firstly decreases quickly to a minimum value as the critical magnetic field Ωc is reached, then it increases abruptly to a maximum value and finally it will be a certain value. Besides, the critical external magnetic Ωc increases when μ is larger. For Ω<Ωc the value of the average fidelity increases with the increasing of μ, but for Ω>Ωc the value of it decreases from a maximum value. The influence of T on the average fidelity is similar with μ.