Entanglement revivals as a probe of scrambling in finite quantum systems

Understand

The entanglement evolution after a quantum quench became one of the tools to distinguish integrable versus chaotic (non-integrable) quantum many-body dynamics.

• Following this line of thoughts, here we propose that the revivals in the entanglement entropy provide a finite-size diagnostic benchmark for the purpose.
• Indeed, integrable models display periodic revivals manifested in a dip in the block entanglement entropy in a finite system.
• On the other hand, in chaotic systems, initial correlations get dispersed in the global degrees of freedom (information scrambling) and such a dip is suppressed.