Faster methods for contracting infinite two-dimensional tensor networks

We revisit the corner transfer matrix renormalization group (CTMRG) method of Nishino and Okunishi for contracting two-dimensional (2D) tensor networks and demonstrate that its performance can be substantially improved by determining the tensors using an eigenvalue solver as opposed to the power met...

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Published in:Physical review. B 2018-12, Vol.98 (23), p.1, Article 235148
Main Authors: Fishman, M. T., Vanderstraeten, L., Zauner-Stauber, V., Haegeman, J., Verstraete, F.
Format: Article
Language:English
Subjects:
Contraction
Eigenvalues
Hamiltonian functions
Mathematical analysis
Tensors
Transfer matrices
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description We revisit the corner transfer matrix renormalization group (CTMRG) method of Nishino and Okunishi for contracting two-dimensional (2D) tensor networks and demonstrate that its performance can be substantially improved by determining the tensors using an eigenvalue solver as opposed to the power method used in CTMRG. We also generalize the variational uniform matrix product state (VUMPS) ansatz for diagonalizing 1D quantum Hamiltonians to the case of 2D transfer matrices and discuss similarities with the corner methods. These two new algorithms will be crucial to improving the performance of variational infinite projected entangled pair state (PEPS) methods.
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subjects Contraction
Eigenvalues
Hamiltonian functions
Mathematical analysis
Tensors
Transfer matrices
title Faster methods for contracting infinite two-dimensional tensor networks
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