Exact density matrix for the Kitaev honeycomb spin liquid is organized by string-operator equivalence classes, producing a symmetry-resolved block-diagonal reduced density matrix that explains extensive entanglement-spectrum degeneracy and entropy separability into gauge and matter sectors.
Peschel,Calculation of reduced density matrices from correlation functions, Journal of Physics A: Mathemati- cal and General36, L205 (2003)
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Exact Organization of Density Matrices and Entanglement Structure in the Kitaev Spin Liquid
Exact density matrix for the Kitaev honeycomb spin liquid is organized by string-operator equivalence classes, producing a symmetry-resolved block-diagonal reduced density matrix that explains extensive entanglement-spectrum degeneracy and entropy separability into gauge and matter sectors.