The coherent exchange of energy between materials and optical fields leads to strong light–
matter interactions and so-called polaritonic states with intriguing properties, halfway …

It is possible to modify the chemical and physical properties of molecules, not only through
chemical modifications but also by coupling molecules strongly to light. More intriguingly …

Polaritons are quasiparticles that form in semiconductors when an elementary excitation
such as an exciton or a phonon interacts sufficiently strongly with light. In particular, exciton …

Nonlinear interactions between excitons strongly coupled to light are key for accessing
quantum many-body phenomena in polariton systems. Atomically-thin two-dimensional …

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

Superfluidity—the suppression of scattering in a quantum fluid at velocities below a critical
value—is one of the most striking manifestations of the collective behaviour typical of Bose …

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 …

In the past decade, a two-dimensional matter-light system called the microcavity exciton-
polariton has emerged as a new promising candidate of Bose-Einstein condensation (BEC) …

Quantum fluids exhibit quantum mechanical effects at the macroscopic level, which contrast
strongly with classical fluids. Gain-dissipative solid-state exciton-polaritons systems are …

Parametric nonlinear optical processes are at the heart of nonlinear optics underpinning the
central role in the generation of entangled photons as well as the realization of coherent …