Entanglement Protection of Two-Qubit System in Non-Markovian Reservoir via Weak Measurement and Weak Measurement Reversal

The protection schemes of the entanglement in the system of two entangled atoms from nonMarkovian reservoirs via previous Weak measurement(pre-WM) and posterior Weak measurement reversal(post-WMR) are investigated. We firstly compare the effects of combination applying of pre-WM and post-WMR(scheme 1) and twice Weak measurements(WMs)(scheme2) in the condition of different initial entangled states.The analysis indicates that the protection performance of scheme 1 is much better than that of scheme 2. The scheme1 was utilized when the system of two entangled atoms suffers from the independent reservoirs. The numerical results show that the combination of pre-WM and postWMR can effectively enhance entanglement and shorten the time of Entanglement sudden death(ESD) in nonMakovain environment. We have found the optimum of WM strengthens is drastically related to the initial entangled state.