Lieb-Robinson Bound and Almost-Linear Light Cone in Interacting Boson Systems

Tomotaka Kuwahara, Keiji Saito

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, we investigate how quickly local perturbations propagate in interacting boson systems with Bose-Hubbard-type Hamiltonians. In general, these systems have unbounded local energies, and arbitrarily fast information propagation may occur. We focus on a specific but experimentally natural situation in which the number of bosons at any one site in the unperturbed initial state is approximately limited. We rigorously prove the existence of an almost-linear information-propagation light cone, thus establishing a Lieb-Robinson bound: the wave front grows at most as t log2(t). We prove the clustering theorem for gapped ground states and study the time complexity of classically simulating one-dimensional quench dynamics, a topic of great practical interest.

Original languageEnglish
Article number070403
JournalPhysical review letters
Volume127
Issue number7
DOIs
Publication statusPublished - 2021 Aug 13

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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