Effects of Inhomogeneous Spin Coupling and Anisotropy on Thermal Entanglement

Xiaoguang Wang

Gehad Sadiek, Samaher Almalki

Jin‐Liang Guo, Huang Xiao-Li, He‐Shan Song

We study the thermal entanglement properties of a simple system that includes three spins inhomogeneously coupled between them with additional anisotropy in their couplings. The main result is the systematic analysis of the concurrence evolution as functions of inhomogeneity, anisotropy and temperature. By adjusting proportional factor of the interaction J and anisotropy parameter Δ, the comparison between concurrences C 12 and C 13 is also presented.

Wanli Yang, Wei Hua, Feng Mang +1 more

We theoretically explore the possibility of realizing controllable thermal entanglement of effective spins in a four-qubit anisotropic Heisenberg XXZ coupling spin-star system constructed by coupled microcavities. We analyse the dependence of thermal entanglement in this system on temperature, inhomogeneity of the magnetic field, and anisotropy, which can be readily tuned via the external laser fields. The peculiar characteristic and the full controllability of the thermal entanglement are demonstrated to be useful for quantum information processing.

N. Canosa, R. Rossignoli

Da-Chuang Li, Zhuo‐Liang Cao