arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1402.4175math-phcond-mat.stat-mechmath.MPquant-ph
收藏

矩阵乘积态的母体哈密顿量的微扰理论

Perturbation Theory for Parent Hamiltonians of Matrix Product States

Oleg Szehr, Michael M. Wolf

摘要:

本文研究了矩阵乘积态的正则母哈密顿量的基态子空间对局部扰动的稳定性。我们证明了这样的哈密顿量的谱隙在弱的局部扰动下保持稳定,即使在热力学极限下,整个扰动可能没有界。我们的讨论是基于D.A. Yarotsky以前的工作,该工作发展了经典哈密顿量的相对有界量子微扰的微扰理论。我们利用重整化过程,在大尺度上将矩阵乘积态的父哈密顿量转化为经典哈密顿量加上一些微扰。因此,我们可以推广D.A.Yarotsky的结果,为矩阵乘积态的母体哈密顿量提供一个微扰理论,并恢复了S. Michalakis等人[arXiv:1109.1588]和J. I. Cirac等人[arXiv:1306.4003]。

英文摘要:

This article investigates the stability of the ground state subspace of a canonical parent Hamiltonian of a Matrix product state against local perturbations. We prove that the spectral gap of such a Hamiltonian remains stable under weak local perturbations even in the thermodynamic limit, where the entire perturbation might not be bounded. Our discussion is based on preceding work by D.A. Yarotsky that develops a perturbation theory for relatively bounded quantum perturbation of classical Hamiltonians. We exploit a renormalization procedure, which on large scale transforms the parent Hamiltonian of a Matrix product state into a classical Hamiltonian plus some perturbation. We can thus extend D.A. Yarotsky's results to provide a perturbation theory for parent Hamiltonians of Matrix product states and recover some of the findings of independent contributions by S. Michalakis et al. [arXiv:1109.1588] and J. I. Cirac et al. [arXiv:1306.4003].

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。

↑