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arXiv quant-ph/0406202quant-ph
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Kitaev模型中的基态纠缠和几何熵

Ground state entanglement and geometric entropy in the Kitaev's model

A. Hamma, R. Ionicioiu, P. Zanardi

摘要:

研究了Kitaev模型中基态的纠缠特性。这是一个二维自旋系统,具有环面拓扑结构和自旋之间的非平凡四体相互作用。对于一个通用的分区$(A,B)$的晶格,我们计算解析的冯诺伊曼熵的约化密度矩阵$ρ_A$在基态。证明了区域$A$的几何熵与其边界的长度成线性关系。此外,我们认为纠缠可以探测系统的拓扑结构,揭示系统的拓扑有序性。最后,我们找到了在给定的基态下使纠缠最大化的一个量子分块。

英文摘要:

We study the entanglement properties of the ground state in Kitaev's model. This is a two-dimensional spin system with a torus topology and nontrivial four-body interactions between its spins. For a generic partition $(A,B)$ of the lattice we calculate analytically the von Neumann entropy of the reduced density matrix $ρ_A$ in the ground state. We prove that the geometric entropy associated with a region $A$ is linear in the length of its boundary. Moreover, we argue that entanglement can probe the topology of the system and reveal topological order. Finally, no partition has zero entanglement and we find the partition that maximizes the entanglement in the given ground state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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