Enhancing Atomic Entanglement in a Common Reservoir by Weak Measurement and its Reversal

Abstract

The three two-level atoms, initially prepared in like-W state, interact with a common bosonic reservoir. To suppress environment decoherence and obtain much better entanglement, we firstly perform weak measurement on these atoms before they pass the reservoir, and then, when they have experienced the decoherence environment, the receiver carry out a quantum reversal on all atoms. The results show both the tripartite and bipartite entanglement can be enhanced and the post-reversal measurement is more obvious to promote atomic entanglements than the weak measurement. Increasing the strength of reversal measurement can always improve entanglement. As a price, the success probability decreases with the much greater measure strength.