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arXiv 0903.2432quant-ph
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XY自旋链的算符空间纠缠熵

Operator Space Entanglement Entropy in XY Spin Chains

Iztok Pizorn, Tomaz Prosen

摘要:

算符空间纠缠熵(OSEE)是量子力学中算符表示的复杂性的表征。我们表明,在均匀海森堡XY自旋1/2链的OSEE的初始本地运营商的增长,在最多的几何随时间。对数前面的前因子一般只取决于准粒子色散关系的稳定点的数目,并且对于XY模型,在非平衡稳态中,在量子相变到长程磁关联的点处,前因子从1/3精确地变化到2/3。此外,我们表明,一个小的障碍的存在下触发的OSEE的饱和。

英文摘要:

The complexity of representation of operators in quantum mechanics can be characterized by the operator space entanglement entropy (OSEE). We show that in the homogeneous Heisenberg XY spin 1/2 chains the OSEE for initial local operators grows at most logarithmically with time. The prefactor in front of the logarithm generally depends only on the number of stationary points of the quasi-particle dispersion relation and for the XY model changes from 1/3 to 2/3 exactly at the point of quantum phase transition to long-range magnetic correlations in the non-equilibrium steady state. In addition, we show that the presence of a small disorder triggers a saturation of the OSEE.

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