We investigate the entanglement protection of a qutrit-qutrit system under local amplitude damping channels by weak measurement and measurement reversal. We examine the Δ-type of initially entangled qutrit-qutrit states. We find that the entanglement decays with the decoherence strength increasing for the qutrit-qutrit state. Therefore, we focus on how to protect the quantum entanglement from decoherence by weak measurement and measurement reversal. Our results show that we can prevent amplitude damping decoherence by the combination of prior weak measurement and post optimal measurement reversal comparing with the dynamics without protection. Regardless of the value of decoherence, the protection scheme has better effect on the kind of V-configuration. And with the increase of decoherent strength, the difference is more obvious. Another interesting result is that the enhancement of the entanglement is very weak when decoherent strength is zero.

中文翻译：

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通过弱测量和测量反转保护退相干下的 Qutrit-Qutrit 纠缠

我们通过弱测量和测量反转研究了局部振幅阻尼通道下 qutrit-qutrit 系统的纠缠保护。我们检查最初纠缠的 qutrit-qutrit 状态的 Δ 型。我们发现纠缠随着 qutrit-qutrit 状态的退相干强度的增加而衰减。因此，我们关注如何通过弱测量和测量反转来保护量子纠缠免于退相干。我们的结果表明，与没有保护的动态相比，我们可以通过先弱测量和后优化测量反转相结合来防止幅度阻尼退相干。无论退相干值如何，保护方案对V型构型的效果更好。并且随着退相干强度的增加，差异更加明显。