Spin Entanglement and Magnetic Competition via Long-Range Interactions in Spinor Quantum Optical Lattices

Quantum matter at ultralow temperatures offers a test bed for analyzing and controlling desired properties in strongly correlated systems. Under typical conditions the nature of the atoms fixes the magnetic character of the system. Beyond classical light potentials leading to optical lattices and shortrange interactions, high-Q cavities introduce novel dynamics into the system via the quantumness of light. Here we propose a theoretical model and we analyze it using exact diagonalization and density matrix renormalization group simulations. We explore the effects of cavity mediated long-range magnetic interactions and optical lattices in ultracold matter. We find that global interactions modify the underlying magnetic character of the system while introducing competition scenarios. Antiferromagnetic correlated bosonic matter emerges in conditions beyond what nature typically provides. These allow new alternatives toward the design of robust mechanisms for quantum information purposes, exploiting the properties of magnetic phases of strongly correlated quantum matter.

Automated summary

Quantum matter at ultralow temperatures provides a platform for studying desired properties in strongly correlated systems. Using high-Q cavities and optical lattices, we investigate the effects of cavity-mediated long-range magnetic interactions and the presence of ultra-cold matter. We find that global interactions modify the magnetic character of the system and introduce competition. This leads to the emergence of antiferromagnetic correlated bosonic matter beyond what is typically observed in nature.