Entanglement in a generalized Jaynes-Cummings model

• 来源期刊: 中国物理B（英文版）
• 关键词: thermal entanglement dipole-dipole coupling strength decoherence
• 年，卷（期）: 2007,（12）
• 页码范围: 3595-3600
• 页数: 6页
• 语种: 英文

摘要

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 Phys. Rev. Lett. 87230404). Our results show that the W-type entangled states cannot be generated based on the model. The dependences of entanglement on Rabi frequency λ and dipole-dipole coupling strength Ω are given. It is found that there exists the quantum phase transition when λ = Ω. 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.