Protecting Qutrit-Qutrit Entanglement Under Decoherence via Weak Measurement and Measurement Reversal

We investigate the entanglement protection of a qutrit-qutrit system under local amplitude damping channels by weak measurement and measurement reversal. We examine the Delta-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.