Quantum Nano science is the research area and the branch of nanotechnology and physics that uses methods of quantum mechanics to the design of new types of Nano devices and Nano scale materials, where functionality and structure of quantum Nano devices are described through quantum phenomena and principles such as discretization, superposition and entanglement. A well-known quantum Nano device is a quantum computer, which can be considered as a quantum system for computation that makes direct use of the quantum phenomena superposition and entanglement, to perform quantum operations with quantum states. As an interesting possible quantum Nano device, which should be built by nanotechnology, is a quantum robot. The other example is quantum Nano mechanics that is a new field engendered by the ability to create mechanical Nano resonators with very high frequencies.