Huanqian Loh [Duke]

Abstract: Programmable neutral atom arrays are a promising platform for quantum information processing and quantum simulation. By driving atoms to highly excited Rydberg states, the atoms can be made to interact over long range. In this talk, I will present two recent results on Rydberg atom arrays. First, we demonstrate the tailoring of Rydberg interactions using Floquet frequency modulation. Our frequency modulation approach allows us to achieve Rydberg blockade-entanglement beyond the traditional blockade radius and to transform between the paradigmatic regimes of Rydberg blockade versus facilitation. Second, we report the use of kinetically constrained Rydberg atom arrays to realize a broad class of models where the Hilbert space has been fragmented into exponentially many disconnected subspaces. We experimentally observe several novel forms of quantum many-body dynamics arising from the fragmentation, including quantum many-body scarring starting from a general class of Z_{2k}-ordered initial states, Krylov-restricted thermalization, and an exotic form of localization that occurs despite the presence of nonlocal conservation laws in a disorder-free Hamiltonian.

Research Interests: Quantum information science, quantum simulation, neutral atom arrays