Speeding up the spread of quantum information in chaotic systems

TL;DR

This paper investigates how mild nonlocality influences the speed of quantum information dissemination, entanglement, and operator growth in chaotic systems, revealing that nonlocality generally accelerates information spread with some exceptions.

Contribution

It compares different forms of nonlocality in spin chains and holographic theories, highlighting their effects on information dynamics in chaotic quantum systems.

Findings

Increasing nonlocality generally speeds up information spreading.

In some lattice models, nonlocality can slightly suppress spreading rates.

The study bridges phenomenology between spin chains and holographic gauge theories.

Abstract

We explore the effect of introducing mild nonlocality into otherwise local, chaotic quantum systems, on the rate of information spreading and associated rates of entanglement generation and operator growth. We consider various forms of nonlocality, both in 1-dimensional spin chain models and in holographic gauge theories, comparing the phenomenology of each. Generically, increasing the level of nonlocality increases the rate of information spreading, but in lattice models we find instances where these rates are slightly suppressed.