单变量X态几何关联的动力学特性

Dynamic property of geometric quantum discord of single-parameter X states

基于量子失谐(quantum discord)几何测量(简称GMQD)的方法求解了单变量X态的量子关联.在考虑环境的影响时,采用量子主方程求解出了一阶近似下该态在环境作用后的态.然后通过对比该态的纠缠度以及GMQD,可以发现GMQD具有比量子纠缠更优异的抗消相干性能.

Based on the method of geometric measure of quantum discord（ GMQD）, the paper obtains the quantum relation of the single-parameter X states. The evolved states influenced by environment are calcu- lated with the quantum master equation under one-order approximation. Through comparing the entangle- ment degree and GMQD of the evolved states, it comes to the conclusion that GMQD shows a stronger re- sistance to de-coherence than quantum entanglement.