Entanglement in a generalized Jaynes--Cummings model |
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Authors: | Zhang Guo-Feng and Liu Jia |
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Institution: | Department of Physics, School of Sciences, Beijing University of Aeronauticsand Astronautics, Beijing 100083, China |
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Abstract: | We investigate the pairwise entanglement and global entanglement in a
generalized Jaynes--Cummings model, which can be used to realize
Greenberger--Horne--Zeilinger (GHZ) entangled state (Zheng S B 2001
{\it Phys. Rev. Lett.} {\bf 87} 230404). Our results show that the
W-type entangled states cannot be generated based on the model. The
dependences of entanglement on Rabi frequency $\lambda$ and
dipole--dipole coupling strength ${\it \Omega}$ are given. It is
found that there exists the quantum phase transition when
$\lambda={\it \Omega}$. For typical experimental data, the critical
temperature for pairwise entanglement is on the order of
$10^{-6}$\,K. Based on these results, two strategies that overcome
decoherence are proposed. |
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Keywords: | thermal entanglement dipole--dipole coupling strength decoherence |
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