In quantum nanophotonics, researchers explore the behavior of photons when they are confined to structures with dimensions close to the wavelength of light. This confinement leads to phenomena such as quantum confinement, quantum entanglement, and quantum superposition. By designing and fabricating nanostructures, like photonic crystals, plasmonic nanoparticles, and quantum dots, scientists can control and manipulate light in ways that are not possible with conventional optical materials.