The quasi-particle picture is a powerful tool to understand the entanglement spreading in many-body quantum systems after a quench. As an input, the structure of the excitations' pattern of the initial state must be provided, the common choice being pairwise-created excitations. However, several cases exile this simple assumption. In this work, we investigate weakly-interacting to free quenches in one dimension. This results in a far richer excitations' pattern where multiplets with a larger number of particles are excited. We generalize the quasi-particle ansatz to such a wide class of initial states, providing a small-coupling expansion of the Renyi entropies. Our results are in perfect agreement with iTEBD numerical simulations.
Cited by 3
Pasquale Calabrese, Entanglement spreading in non-equilibrium integrable systems
SciPost Phys. Lect. Notes, 20 (2020) [Crossref]
Ranjan Modak et al., Entanglement revivals as a probe of scrambling in finite quantum systems
J. Stat. Mech. 2020, 083110 (2020) [Crossref]
Vincenzo Alba et al., Spreading of correlations in Markovian open quantum systems
Phys. Rev. B 103, L020302 (2021) [Crossref]
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- 1 Institute of Physics, University of Amsterdam [IoP, UvA]
- 2 Scuola Internazionale Superiore di Studi Avanzati / International School for Advanced Studies [SISSA]