  Nanoscale quantum optics explores quantum phenomena in nanophotonics systems
for advancing fundamental knowledge in nano and quantum optics and for
harnessing the laws of quantum physics in the development of new
photonics-based technologies. Here, we review recent progress in the field with
emphasis on four main research areas: Generation, detection, manipulation and
storage of quantum states of light at the nanoscale, Nonlinearities and
ultrafast processes in nanostructured media, Nanoscale quantum coherence,
Cooperative effects, correlations and many-body physics tailored by strongly
confined optical fields. The focus is both on basic developments and
technological implications, especially for what concerns information and
communication technology, sensing and metrology, and energy efficiency.
