# Thermalization of entanglement

## Author(s): Zhang, Liangsheng; Kim, Hyungwon; Huse, David A

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 Abstract: We explore the dynamics of the entanglement entropy near equilibrium in highly entangled pure states of two quantum-chaotic spin chains undergoing unitary time evolution. We examine the relaxation to equilibrium from initial states with either less or more entanglement entropy than the equilibrium value, as well as the dynamics of the spontaneous fluctuations of the entanglement that occur in equilibrium. For the spin chain with a time-independent Hamiltonian and thus an extensive conserved energy, we find slow relaxation of the entanglement entropy near equilibration. Such slow relaxation is absent in a Floquet spin chain with a Hamiltonian that is periodic in time and thus has no local conservation law. Therefore, we argue that slow diffusive energy transport is responsible for the slow relaxation of the entanglement entropy in the Hamiltonian system. Publication Date: Jun-2015 Electronic Publication Date: 19-Jun-2015 Citation: Zhang, Liangsheng, Kim, Hyungwon, Huse, David A. (2015). Thermalization of entanglement. Physical Review E, 91 (6), 10.1103/PhysRevE.91.062128 DOI: doi:10.1103/PhysRevE.91.062128 ISSN: 1539-3755 EISSN: 1550-2376 Type of Material: Journal Article Journal/Proceeding Title: Physical Review E Version: Author's manuscript