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.
Laflorencie,Quantum entanglement in condensed mat- ter systems, Physics Reports646, 1 (2016), quantum en- tanglement in condensed matter systems
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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.