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Brehm, E.; Brunner, I.; Jaud, D. and Schmidt-Colinet, C. (2016): Entanglement and topological interfaces. In: Fortschritte der Physik - Progress of Physics, Vol. 64, No. 6-7: pp. 516-535

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In this paper we consider entanglement entropies in two-dimensional conformal field theories in the presence of topological interfaces. Tracing over one side of the interface, the leading term of the entropy remains unchanged. The interface however adds a subleading contribution, which can be interpreted as a relative (Kullback-Leibler) entropy with respect to the situation with no defect inserted. Reinterpreting boundaries as topological interfaces of a chiral half of the full theory, we rederive the left/right entanglement entropy in analogy with the interface case. We discuss WZW models and toroidal bosonic theories as examples.

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