- Accepted Paper
Typical entanglement in anyon chains: Page curves beyond Lie group symmetries
PRX Quantum - Accepted 15 October, 2026
DOI: https://doi.org/10.1103/w3wp-9wc5
PRX Quantum - Accepted 15 October, 2026
DOI: https://doi.org/10.1103/w3wp-9wc5
We study bipartite entanglement statistics in one-dimensional anyon chains, whose Hilbert spaces are constrained by fusion rules of unitary pre-modular categories. Our setup generalizes previous frameworks on symmetry-resolved entanglement entropy for non-abelian Lie group symmetries to the setting of quantum groups. We derive analytical expressions for the Haar-averaged anyonic entanglement entropy and its variance within a fixed total topological charge sector. Surprisingly, despite the constrained Hilbert space structure, the large expansion has no universal or symmetry-type corrections except for a subleading topological correction term that produces a Page curve asymmetry. We further show that the variance decays exponentially with system size, establishing the typicality. Numerical simulations of the integrable and quantum-chaotic golden chain Hamiltonian show that chaotic mid-spectrum eigenstates match the Haar-random predictions, supporting the use of eigenstate entanglement as a diagnostic of quantum chaos. Our results establish the anyonic Page curve as an appropriate chaotic benchmark in topological many-body systems and connect anyonic entanglement to Page-type universality in quantum many-body physics.
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