Controlling many-body dynamics with driven quantum scars in Rydberg atom arrays

Abstract

Controlling non-equilibrium quantum dynamics in many-body systems is an outstanding challenge as interactions typically lead to thermalization and a chaotic spreading throughout Hilbert space. We experimentally investigate non-equilibrium dynamics following rapid quenches in a many-body system composed of 3 to 200 strongly interacting qubits in one and two spatial dimensions. Using a programmable quantum simulator based on Rydberg atom arrays, we probe coherent revivals corresponding to quantum many-body scars. Remarkably, we discover that scar revivals can be stabilized by periodic driving, which generates a robust subharmonic response akin to discrete time-crystalline order. We map Hilbert space dynamics, geometry dependence, phase diagrams, and system-size dependence of this emergent phenomenon, demonstrating novel ways to steer entanglement dynamics in many-body systems and enabling potential applications in quantum information science.

Supplementary materials at the end

References in corpus (10)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Thermalization and its mechanism for generic isolated quantum systems
• Probing many-body dynamics on a 51-atom quantum simulator
• Many body localization and thermalization in quantum statistical mechanics
• Experimental Observation of a Generalized Gibbs Ensemble
• Emergent SU(2) dynamics and perfect quantum many-body scars
• Periodically driven ergodic and many-body localized quantum systems
• Dynamical crystallization in a low-dimensional Rydberg gas
• Competing density-wave orders in a one-dimensional hard-boson model
• Dynamics of the vacuum state in a periodically driven Rydberg chain