Higher-order topological phase of interacting photon pairs

Abstract

Topological phases open a door to such intriguing phenomena as unidirectional propagation and disorder-resilient localization at a stable frequency. Recently discovered higher-order topological phases further extend the concept of topological protection enabling versatile control over localization in multiple dimensions. Motivated by the recent advances in quantum technologies such as large coherently operating qubit ensembles, we predict and investigate the higher-order topological phase of entangled photon pairs emerging due to the effective photon-photon interaction. Being feasible for state-of-the-art experimental capabilities, the designed model provides an interesting example of interaction-induced topological transitions in the few-particle two-dimensional system.

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• Unveiling Higher-Order Topology via Polarized Topological Charges
• Long-Range Four-body Interactions in Structured Nonlinear Photonic Waveguides
• Interaction-Induced Higher-Order Topological Insulator via Floquet Engineering
• Vortex bound states in dimerized $\pi$-flux optical lattices: characterization, state preparation and current measurement