二体三能级系统在光子晶体中的提纯复苏

Distillability Resuscitation of Qutrit-qutrit System in a Photonic Crystal

研究了在两上能级间驱动场的作用下,一个3×3纠缠系统在各向异性光子晶体中提纯特性随时间的演化。通过数值计算,我们发现虽然该系统有发生提纯猝死的可能,但在合适的条件下系统会在提纯猝死后出现提纯复苏的现象。束缚纠缠态(不能提纯的纠缠态)在系统中的持续时间由驱动场的拉比频率以及原子能级和光子晶体禁带带边的相对位置决定。

We study the distillability of an initially distillable two-qutrit entangled state in anisotropic bandgap photonic crystal with one resonant frequency between the two upper levels. We find distillability sudden death may occur in such qutrit-qutrit system. But distillability resuscitation can be found after this phenomenon in suitable condition. The duration of bound-entangled state （non-distillable） is controlled by the resonant control laser and the detuning of the atomic frequency inside the gap with respect to the bandedge.