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Title: Algebraically contractible topological tensor network states
Authors: Denny, S.J.
Biamonte, J.D.
Jaksch, D. 
Clark, S.R. 
Issue Date: 13-Jan-2012
Source: Denny, S.J.,Biamonte, J.D.,Jaksch, D.,Clark, S.R. (2012-01-13). Algebraically contractible topological tensor network states. Journal of Physics A: Mathematical and Theoretical 45 (1) : -. ScholarBank@NUS Repository.
Abstract: We adapt the bialgebra and Hopf relations to expose internal structure in the ground state of a Hamiltonian with Z2 topological order. Its tensor network description allows for exact contraction through simple diagrammatic rewrite rules. The contraction property does not depend on specifics such as geometry, but rather originates from the non-trivial algebraic properties of the constituent tensors. We then generalise the resulting tensor network from a spin-1/2 lattice to a class of exactly contractible states on spin-S degrees of freedom, yielding the most efficient tensor network description of finite Abelian lattice gauge theories. We gain a new perspective on these states as examples of two-dimensional quantum states with algebraically contractible tensor network representations. The introduction of local perturbations to the network is shown to reduce the von Neumann entropy of string-like regions, creating an unentangled sub-system within the bulk in a certain limit. We also show how local perturbations induce finite-range correlations in this system. This class of tensor networks is readily translated onto any lattice, and we differentiate between the physical consequences of bipartite and non-bipartite lattices on the properties of the corresponding quantum states. We explicitly show this on the hexagonal, square, kagome and triangular lattices.
Source Title: Journal of Physics A: Mathematical and Theoretical
ISSN: 17518113
DOI: 1/015309
Appears in Collections:Staff Publications

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