Quantum dimensions from local operator excitations in the Ising model
2017 (English)In: Journal of Physics A: Mathematical and Theoretical, ISSN 1751-8113, E-ISSN 1751-8121, Vol. 50, no 5, 055002Article in journal (Refereed) Published
We compare the time evolution of entanglement measures after local operator excitation in the critical Ising model with predictions from conformal field theory. For the spin operator and its descendants we find that Rényi entropies of a block of spins increase by a constant that matches the logarithm of the quantum dimension of the conformal family. However, for the energy operator we find a small constant contribution that differs from the conformal field theory answer equal to zero. We argue that the mismatch is caused by the subtleties in the identification between the local operators in conformal field theory and their lattice counterpart. Our results indicate that evolution of entanglement measures in locally excited states not only constraints this identification, but also can be used to extract non-trivial data about the conformal field theory that governs the critical point. We generalize our analysis to the Ising model away from the critical point, states with multiple local excitations, as well as the evolution of the relative entropy after local operator excitation and discuss universal features that emerge from numerics. © 2017 IOP Publishing Ltd.
Place, publisher, year, edition, pages
Institute of Physics (IOP), 2017. Vol. 50, no 5, 055002
conformal field theory, Ising model, local operator excitation, quantum dimension, relative entropy, Rényi entropy
IdentifiersURN: urn:nbn:se:kth:diva-202233DOI: 10.1088/1751-8121/aa5202ScopusID: 2-s2.0-85010051120OAI: oai:DiVA.org:kth-202233DiVA: diva2:1077813
Article. QC 201703012017-03-012017-03-012017-03-01Bibliographically approved