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Thermal Entanglement of the Two-Qubit Heisenberg Spin Chain Coupled to a Single-Mode Cavity Field

机译:双态Heisenberg旋转链的热缠绕耦合到单模腔场

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摘要

Thermal entanglement of a two-qubit Heisenberg spin chain coupled to a single mode cavity field is investigated. It is found that (1) thermal entanglement without the rotating-wave approximation (RWA) is explicitly smaller than that obtained with the RWA, which means that the counter-rotating terms have a large impact on thermal entanglement, therefore they cannot be neglected; (2) the case (ω?Ω) is more beneficial for enhancing thermal entanglement than the resonance case (ω=Ω), the near-resonant case (ω≈Ω) and the case (ω?Ω); (3) for thermal entanglement, there is a competition process between the exchange coupling J (the direct-coupling between the two two-level atoms) and the coupling constant g (which deduces the indirect effect between the two two-level atoms); the critical value of g increases with the spin coupling strength J.
机译:研究了与单模腔场联合的双时态Heisenberg旋转链的热纠缠。 发现(1)没有旋转波近似(RWA)的热缠绕明确小于与RWA获得的热缠结,这意味着反向旋转术语对热缠绕产生大的影响,因此它们不能被忽略; (2)情况(ω≤Ω)比增强比谐振盒(ω=ω),近谐振盒(ω≈ω)和壳体(ωΩω)更具有益的情况; (3)对于热缠绕,交换耦合j(两个两级原子之间的直接耦合)和耦合常数g之间存在竞争过程(这推出了两个两级原子之间的间接效果); 通过自旋耦合强度J增加G的临界值。

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