Protecting Quantum Information via Many-Body Dynamical Localization

TL;DR

This paper investigates many-body dynamical localization in a disorder-free quantum spin chain, revealing phases, dynamical decoupling effects, and potential for robust quantum information storage at high temperatures.

Contribution

It demonstrates disorder-free many-body dynamical localization in a quantum XY spin chain and proposes its application in protecting quantum information.

Findings

Identification of localization and delocalization phases.

Observation of local dynamical decoupling and persistent Rabi oscillations.

Proposal for high-temperature quantum information protection.

Abstract

Dynamically localized states in quantum many-body systems are fundamentally important in understanding quantum thermalization and have applications in quantum information processing. Here we explore many-body dynamical localization (MBDL) without disorders in a non-integrable quantum XY spin chain under periodical and quadratic kicks. We obtain the localization phase regimes with the MBDL and delocalized states and show dynamical observables to extract the phase regimes. For proper kick strengths in the MBDL phase, we reveal a local dynamical decoupling effect for persistent Rabi oscillation of certain spins. Furthermore, we propose the MBDL-protected quantum information at high temperatures, and present an analysis of the dynamical decoupling to obtain the required system parameters for quantum storage. Compared to other non-thermalized states, the disorder-free MBDL states require much fewer repetitions and resources, providing a promising way to protect and store quantum information robust against thermal noises.