arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1002.1405cond-mat.str-elcond-mat.stat-mechphysics.comp-phquant-ph
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张量网络态的重整化

Renormalization of tensor-network states

H. H. Zhao, Z. Y. Xie, Q. N. Chen, Z. C. Wei, J. W. Cai, T. Xiang

摘要:

我们讨论了经典统计或相互作用量子晶格模型的张量网络表示,并全面介绍了我们最近提出的研究二维张量网络态/模型的数值方法。在计算经典张量网络模型的配分函数或量子张量网络态的期望值时,引入第二重正化方案,考虑环境的贡献。它显著地提高了粗粒度张量重整化群方法的精度。在量子张量网络态的研究中,我们指出环境的重正化效应可以用键矢有效而准确地描述。这与波函数的虚时间演化相结合,提供了一种精确的投影方法来确定张量网络波函数。它大大降低了截断误差,使张量网络状态与一个大的键维,这是很难被访问的其他方法,以准确地确定。

英文摘要:

We have discussed the tensor-network representation of classical statistical or interacting quantum lattice models, and given a comprehensive introduction to the numerical methods we recently proposed for studying the tensor-network states/models in two dimensions. A second renormalization scheme is introduced to take into account the environment contribution in the calculation of the partition function of classical tensor network models or the expectation values of quantum tensor network states. It improves significantly the accuracy of the coarse grained tensor renormalization group method. In the study of the quantum tensor-network states, we point out that the renormalization effect of the environment can be efficiently and accurately described by the bond vector. This, combined with the imaginary time evolution of the wavefunction, provides an accurate projection method to determine the tensor-network wavfunction. It reduces significantly the truncation error and enable a tensor-network state with a large bond dimension, which is difficult to be accessed by other methods, to be accurately determined.

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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