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arXiv quant-ph/0405109quant-ph
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自旋-玻色子量子相变中的纠缠和熵

Entanglement and Entropy in a Spin-Boson Quantum Phase Transition

N. Lambert, C. Emary, T. Brandes

摘要:

利用Dicke(超辐射)哈密顿量研究了原子系综与单个玻色子场模相互作用系统的纠缠特性。该模型表现出量子相变和一个很好理解的热力学极限,允许识别量子和半经典的多体功能的纠缠行为。我们考虑原子与光场之间的纠缠,这一研究始于[N。兰伯特角Emary和T. Brandes,Phys. Rev. Lett. {\bf 92},%073602(2004)]。在热力学极限下,我们给出了所有纠缠分块的精确结果,并观察到原子-场纠缠的对数发散和平均线性熵的不连续性。

英文摘要:

We investigate the entanglement properties of an ensemble of atoms interacting with a single bosonic field mode via the Dicke (superradiance) Hamiltonian. The model exhibits a quantum phase transition and a well-understood thermodynamic limit, allowing the identification of both quantum and semi-classical many-body features in the behaviour of the entanglement. We consider the entanglement between the atoms and the field, an investigation initiated in [N. Lambert, C. Emary and T. Brandes, Phys. Rev. Lett. {\bf 92}, %073602 (2004)]. In the thermodynamic limit, we give exact results for all entanglement partitions and observe a logarithmic divergence of the atom-field entanglement, and discontinuities in the average linear entropy.

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