Renyi entropies for classical stringnet models

Abstract

In quantum mechanics, stringnet condensed states - a family of prototypical states exhibiting non-trivial topological order - can be classified via their long-range entanglement properties, in particular topological corrections to the prevalent area law of the entanglement entropy. Here we consider classical analogs of such stringnet models whose partition function is given by an equal-weight superposition of classical stringnet configurations. Our analysis of the Shannon and Renyi entropies for a bipartition of a given system reveals that the prevalent volume law for these classical entropies is augmented by subleading topological corrections that are intimately linked to the anyonic theories underlying the construction of the classical models. We determine the universal values of these topological corrections for a number of underlying anyonic theories including su(2)_k, su(N)_1, and su(N)_2 theories.

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• A Rényi entropy perspective on topological order in classical toric code models
• Topological and nontopological degeneracies in generalized string-net models
• Entanglement in topological systems
• Finite-temperature properties of string-net models