Observation of anomalous information scrambling in a Rydberg atom array

TL;DR

This paper reports the observation of unusual information scrambling behavior in a Rydberg atom array, revealing persistent oscillations and weak ergodicity breaking linked to quantum many-body scars.

Contribution

It demonstrates anomalous information scrambling in a Rydberg atom system, highlighting non-thermal dynamics due to quantum many-body scars, which is a novel observation.

Findings

Persistent oscillations inside a suppressed light cone

Anomalous information spreading different from thermal and localized cases

Evidence of weak ergodicity breaking in the system

Abstract

Quantum information scrambling, which describes the propagation and effective loss of localinformation, is crucial for understanding the dynamics of quantum many-body systems. We report the observation of anomalous information scrambling in an atomic tweezer array with dominant van der Waals interaction. We characterize information spreading by an out-of-time-order correlator and observe persistent oscillations inside a suppressed linear light cone for the initial Neel state. Such an anomalous dynamic, which differs from both generic thermal and many-body localized scenarios, originates from weak ergodicity breaking in quantum many-body scarred systems.