Experimental chapter that presents examples of quantum processes concerning single quantum systems, i.e. sequences comprising a state preparation part, an evolution or propagation part due to the interaction with the outer world, and a detection part. The whole sequence is repeated and its successive results stored. The examples concern quantum control of trapped ions and microwave photonsinteracting in a nondestructive way with Rydberg state cavities. It also presents "boson sampling" of photons placed in a multimode linear interferometer, a system likely to exhibit "quantum advantage," atoms trapped in an optical lattice, a promising platform for quantum simulation of complex systems, generation of "Schrödinger cats" in superconducting circuits.