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 nonintegrable quantum $\mathit{XY}$ 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 regipmes. 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 nonthermalized 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.

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• Dynamical localization
• Eigenstate thermalization
• Many-body localization
• Quantum information processing
• Quantum simulation
• Quantum spin models
• Superconducting qubits
• Ultracold gases
• Tensor network methods