A computer made from components (mechanical, electronic, or otherwise) on a nanometer scale.
a classical computer that may rely on quantum states to carry out classical computations
a computer whose physical dimensions are microscopic
A computer with parts built on a molecular scale.
Nanocomputer is the logical name for a computer smaller than the microcomputer, which is smaller than the minicomputer. (The minicomputer is called "mini" because it was a lot smaller than the original (mainframe) computers.) More technically, it is a computer whose fundamental parts are no bigger than a few nanometers.