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Series in condensed matter physics

Simulations Based on Matrix Product States and Projected Entangled Pair States

V. Murg, Ignacio Cirac, Frank Verstraete

Published Nov 2, 2010• 0 citations
Publisher
DOI
10.1201/b10273-28

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Projected entangled pair states (PEPS) are a class of tensor networks that are believed to represent a wide variety of two-dimensional physical quantum states. However, unlike their well-known one-dimensional counterparts, the matrix product states (MPS), numerical simulations with PEPS suffer from instabilities that can be traced back to the lack of a canonical form. The authors describe how to convert a PEPS into a canonical form analogous to the one for an MPS. It is expected that this canonical form will make possible improved analytical and numerical approaches for PEPS.
These are lecture notes from the 44th IFF Spring School "Quantum Information Processing" in Juelich, discussing applications of entanglement theory in condensed matter. The focus of the notes is on tensor network states, in particular Matrix Product States (MPS) and Projected Entangled Pair States (PEPS), which provide an efficient description of many-body states based on their entanglement structure; both numerical and analytical aspects of tensor networks are being covered. The notes close with a brief introduction to quantum complexity, which allows to assess the limitations to our ability to simulate quantum many-body systems.