Entanglement sudden death of two atoms interacting with a cavity via the two-photon process in a strong-driving-assisted system
Chen Li(陈丽)a),Shao Xiao-Qiang(邵晓强) b), and Zhang Shou(张寿)a)b)†
a Department of Physics, College of Science, Yanbian University, Yanji 133002, China; b Center for the Condensed-Matter Science and Technology, Harbin Institute of Technology, Harbin 150001, China
Abstract We examine the entanglement dynamics between two strongly driven atoms off-resonantly coupled with a single-mode cavity via the two-photon process with the help of negativity in two different types of initial states. The results show that entanglement sudden death may occur under both the above conditions and the sudden death effect can be monitored by modulating the atom--cavity detunings. Furthermore, we also find an atomic decoherence-free subspace so that the initial entanglement between two atoms remains invariable in application.
Received: 21 February 2009
Revised: 31 March 2009
Accepted manuscript online:
PACS:
03.67.Lx
(Quantum computation architectures and implementations)
Fund: Project supported by the National
Natural Science Foundation of China (Grant No 60667001) and the
Education Foundation of Yanbian University of China.
Cite this article:
Chen Li(陈丽),Shao Xiao-Qiang(邵晓强), and Zhang Shou(张寿) Entanglement sudden death of two atoms interacting with a cavity via the two-photon process in a strong-driving-assisted system 2009 Chin. Phys. B 18 4676
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