.png){kind=icon}
.png){kind=icon}
Return
Variational methods for contracting projected entangled-pair states
.png){kind=icon}
OA
AI
DOI：10.1103/PhysRevB.105.195140.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
The norms or expectation values of infinite projected entangled-pair states (PEPS) cannot be computed exactly, and approximation algorithms have to be applied. In the last years, many efficient algorithms have been devised-the corner transfer matrix renormalization group (CTMRG) and variational uniform matrix product state (VUMPS) algorithm are the most common-but it remains unclear whether they always lead to the same results. In this paper, we identify a subclass of PEPS for which we can reformulate the contraction as a variational problem that is algorithm independent. We use this variational feature to assess and compare the accuracy of CTMRG and VUMPS contractions. Moreover, we devise a new variational contraction scheme, which we can extend to compute general N-point correlation functions.
Keywords:
MATRIX RENORMALIZATION-GROUP
ALGORITHM
Journal
IF:
3.7
Papers:
15.4W
Citations:
41.0W