Confining electromagnetic fields in cavities has emerged as an important new tool to create and control complex quantum systems. The first experimental realizations were based on ultracold atoms and on semiconductor heterostructures with the generation of polaritonic quantum fluids of light. Since then, efforts on applications in quantum technologies are ongoing, where extremely well controlled atomic or ionic building blocks are assembled to
generate highly entangled states of matter. Besides the promising advancements for quantum simulation and computing, the recent achievements in cavity-enabled control of molecular reactions and the manipulation of electronic properties in strongly correlated electronic materials have opened two new and rapidly evolving research directions.

This interdisciplinary workshop brings together leading experts and early-career researchers working on different aspects of cavity control, and provides an environment to share ideas, find synergies and establish new collaborations. Topics will include cavity field fluctuations, cavity polaritonics, cavity control of phase transitions in ultracold atoms and in materials, entanglement for quantum networks, as well as applications in quantum sensing, quantum computing, and quantum simulation.