Entanglement in a two-qubit Heisenberg XXZ chain with different Dzyaloshinskii-Moriya couplings and an inhomogeneous magnetic field

Abstract

Ground state entanglement and thermal entanglement of a two-qubit Heisenberg XXZ chain in the presence of the different Dzyaloshinski-Moriya interaction and inhomogeneous magnetic field are investigated. By the concept of concurrence, we find that the inhomogeneity of the magnetic field may make entanglement last for a long time and the critical temperature is dependent on Jz and b. The entanglement can be increased by increasing the temperature in some cases. We also find that the x-component parameter Dx has a higher critical temperature and more entanglement for a certain condition than the z-component parameter Dz.

Determinate joint remote preparation of an arbitrary W -class quantum state

“…It can be seen that the proposed scheme runs successfully. Since applications of entanglement in quantum information processing such as entanglement distribution [24][25][26] and controlled teleportation [27][28][29][30] are meritorious, then a problem arised in that this method seems useless for its real application value. However, a difference is made when the initial state of (a…”