Abstract

We investigate entanglement dynamics of three driven atoms off-resonantly coupled with a single-mode cavity under quantum-jump-based feedback control. The results demonstrate that the tripartite entanglement can be effectively enhanced and the steady $W$ state and asymmetric $W$ states can be obtained by setting the Rabi frequencies of classical fields and choosing the local quantum feedback control. Furthermore, the tripartite decoherence-free entangled states are found when the atoms are driven by classical fields with appropriate Rabi frequencies. The asymmetric $W$ states and $W$ state can be converted into each other via feedback control. In theory, the multiqubit $W$ state can be generated and stabilized by our approach.

© 2013 Optical Society of America

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