Quantum optics Quantum Optics 26 Physics 25 Quantum theory 11 Electronics 9 Materials 9 Optical and Electronic Materials 9 Optical materials 9 Optics, Lasers, Photonics, Optical Devices 9 Quantum computers 9 Quantum Physics 8 Lasers 7 Microwaves 7 Microwaves, RF and Optical Engineering 7 Optical engineering 7 Quantum Information Technology, Spintronics 7 Spintronics 7 Microscopy 5 Spectroscopy and Microscopy 5 Spectrum analysis 5 Classical Electrodynamics 4 Laser Technology, Photonics 4 Optics 4 Photonics 4 Laser spectroscopy 3 Nanoscale Science and Technology 3 Nanoscience 3 Nanostructures 3 Nanotechnology 3 Nanotechnology and Microengineering 3