与Ising链耦合的中心双量子比特系统的量子关联

Quantum correlation for a central two-qubit system coupled to Ising chain

通过对双量子比特系统分别独自与Ising链耦合情形下的关联问题的研究,推导出了量子失协和量子关联几何度量的演化规律.在弱耦合相互作用情况下Ising链的临界点附近,量子关联存在突变.此外本文发现在某段时间内的演化过程中几何量子关联度保持不变.

Studying quantum correlation dynamics of a central two-qubit system coupled to Ising chain model, we obtain that the evolution of quantum discord and geometric measure of quantum discord for the central atoms. We find that quantum correlation exists a sudden transition in the weak coupled interaction near the quantum critical point of Ising chain. Moreover, the evolution of geometric measure of quantum discord in invariant to some extent.