Nanotechnology is an application of Quantum physics, in a simple way, it is one of the practical aspects of quantum theory, for example, the development of devices that are small, light, self-contained, use little energy and that will replace larger microelectronic equipment depends on the nature of quantum variance, scientists theorize that single-molecule sensors can be developed and that sophisticated memory storage and neural-like networks can be achieved with a very small number of molecules. Quantum theory and mechanics describe the relationship between energy and matter on the atomic and subatomic scale.
My quires about the relation between nanotechnology and quantum computing.