Correlation spreading and properties of the quantum state in quench dynamics

TL;DR

This paper derives from first principles how correlations spread in quantum systems after a quench, revealing that light cone dynamics arise naturally without special post-quench state properties.

Contribution

It provides a fundamental derivation of correlation spreading in quantum quenches, emphasizing quantum and interaction effects without relying on specific state assumptions.

Findings

Light cone spreading is derived from first principles.

Quantum and interaction effects are crucial for correlation dynamics.

Light cone behavior does not depend on peculiar post-quench states.

Abstract

The light cone spreading of correlations following a quantum quench is obtained from first principles. Fully taking into account quantum and interaction effects, the derivation shows how light cone dynamics does not require peculiar properties of the post-quench state.