Recently a new type of system exhibiting spontaneous coherence has emerged—the
exciton–polariton condensate. Exciton–polaritons (or polaritons for short) are bosonic …

This article reviews recent theoretical and experimental advances in the fundamental
understanding and active control of quantum fluids of light in nonlinear optical systems. In …

Topology describes properties that remain unaffected by smooth distortions. Its main
hallmark is the emergence of edge states localized at the boundary between regions …

Two-dimensional lattices of coupled micropillars etched in a planar semiconductor
microcavity offer a workbench to engineer the band structure of polaritons. We report …

We demonstrate that honeycomb arrays of microcavity pillars behave as an optical-
frequency two-dimensional photonic topological insulator. We show that the interplay …

The coupling of two macroscopic quantum states through a tunnel barrier gives rise to
Josephson phenomena such as Rabi oscillations, the ac and dc effects, or macroscopic self …

The extraordinary electronic properties of Dirac materials, the two-dimensional partners of
Weyl semimetals, arise from the linear crossings in their band structure. When the dispersion …

We use coupled micropillars etched out of a semiconductor microcavity to engineer a spin-
orbit Hamiltonian for photons and polaritons in a microstructure. The coupling between the …

Conventional topological insulators support boundary states with dimension one lower than
that of the bulk system that hosts them, and these states are topologically protected due to …

We have observed the unconventional photon blockade effect for microwave photons using
two coupled superconducting resonators. As opposed to the conventional blockade, only …