Quantum thermal discord in a two-spin-1/2 XXZ model
Qiong Wang, Jie‐Qiao Liao, Zeng Hao-Sheng
We study the quantum discord in a two-spin-1/2 XXZ model in thermal equilibrium at temperature T in the presence of an external magnetic field B . Special attention is paid to the dependence of quantum discord on the temperature T and magnetic field B . It is found that quantum thermal discord is more robust than concurrence against temperature, in the sense that quantum thermal discord does not vanish at finite temperatures, but concurrence vanishes completely at a critical temperature.
Chinese Physics B•Oct 1, 2010•31 citations