Entanglement in the XX spin chain with an energy current (4 pages)
Entanglement in the XX spin chain with an energy current (4 pages)
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DOI：
10.1103/physreva.71.042318
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发表时间：
2004-12
影响因子：
2.9
通讯作者：
V. Eisler;Z. Zimborás
中科院分区：
文献类型：
--
作者：
V. Eisler;Z. Zimborás
我们考虑受约束携带能量电流的XX链的基态。计算了L个相邻自旋块的冯诺依曼熵，描述了块与链其余部分的纠缠。最近的计算表明，XX模型中的熵随子系统的大小呈对数发散。我们证明了能量电流的存在增加了对数增长的前因子。这一结果表明，能量流的出现导致了纠缠态的增加。
We consider the ground state of an XX chain that is constrained to carry a current of energy. The von Neumann entropy of a block of L neighboring spins, describing entanglement of the block with the rest of the chain, is computed. Recent calculations have revealed that the entropy in the XX model diverges logarithmically with the size of the subsystem. We show that the presence of the energy current increases the prefactor of the logarithmic growth. This result indicates that the emergence of the energy current gives rise to an increase of entanglement.