Entanglement dynamics in Rule 54: Exact results and quasiparticle picture
arXiv:2104.04513 · doi:10.21468/SciPostPhys.11.6.107
Abstract
We study the entanglement dynamics generated by quantum quenches in the quantum cellular automaton Rule . We consider the evolution from a recently introduced class of solvable initial states. States in this class relax (locally) to a one-parameter family of Gibbs states and the thermalisation dynamics of local observables can be characterised exactly by means of an evolution in space. Here we show that the latter approach also gives access to the entanglement dynamics and derive exact formulas describing the asymptotic linear growth of all Rényi entropies in the thermodynamic limit and their eventual saturation for finite subsystems. While in the case of von Neumann entropy we recover exactly the predictions of the quasiparticle picture, we find no physically meaningful quasiparticle description for other Rényi entropies. Our results apply to both homogeneous and inhomogeneous quenches.
arXiv comment33 pages, 5 figures; v2 accepted version
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