目前，在各种退相干环境中由Horodecki 态构成的两个三能级原子系统的可提纯性纠缠得到了广泛的研究。研究了凸线性组合态的可提纯性演化规律。研究结果表明：初始处于自由纠缠的凸线性组合态在有限的时间内会转变成束缚纠缠态，原子系统的可提纯性出现猝死现象。

Recently the distillability entanglement in qutrit-qutrit systems with Horodecki states under various decoherence is studied widely. The regulation of distillability evolution with convex linear combination states is investigated. The result shows that the convex linear combination states which are initially in the free-entangled states become bound-entangled in a finite time, the phenomenon of distillability sudden death appears in the qutrits systems.